Engineer Profession Tree — Seasons 2 to 6 (Lv 40→100 + Every Seasonal Column)
What This Guide Covers
Engineer is the profession for the build-up phase of a season — faster building, research and resources compound your whole account. If a new season just started, this is the profession you want. Switch to War Leader only once growth is no longer your bottleneck and your alliance is entering the war phase (Desert Storm, Capital Conquest, SvS, Faction Duel). Full stage-by-stage decision table in the Profession System Guide.
Season 1 has its own tier-by-tier walkthrough — Engineer Profession Tree (Season 1). This guide covers everything from Season 2 onward, and it's built around a fact that isn't obvious in-game:
Your permanent Engineer skills (left + middle columns) do not change from season to season. What changes is (1) the Profession Level cap, which rises across seasons and unlocks more tiers of the same core tree, and (2) the right-column seasonal skills, which are swapped out completely every season and refunded when the season ends. So there is no separate "Season 3 core build" — there is one Engineer core tree that simply reaches higher, plus a new seasonal column each season.
The skill names, tiers (unlock levels) and max levels below are taken from the in-game profession data and the season themes are confirmed (frost / desert / blood-night / wild-west / rainforest). Exact effect percentages, the per-season point budget, and the precise spend order are recommendations — confirm the live numbers and your current cap in your own client, as they can be tuned per update and per server.
Profession Level Cap by Season
The cap is what decides how far up the core tree you can reach:
A higher cap means more total skill points, so from S2 the question stops being "can I afford the core economy package?" (you can) and becomes "which of the higher tiers is worth it before the season ends?"
The Extended Engineer Core Tree (Lv 45 → 70)
These are the tiers that open above the Season 1 Lv 40 cap. Season 2 reaches Lv 45–70. Exactly two skills unlock per tier (every 5 levels):
The full Lv 1–70 tree (both columns, with assign/priority for a growth build) is on the Season 2 Profession Point Allocation page — captured in-game and verified against the game data.
Season 3 raises the cap to Lv 100, unlocking five more tiers (Lv 75, 80, 85, 90, 95, 100). Those tiers are not yet confirmed in-game — the raw game data stores overlapping legacy/season layers that can't be auto-resolved into the exact live tree, so we won't print specific Lv 75–100 skill names we haven't seen on a live account. The shape is reliable (two skills per tier, same growth-vs-combat split), and we'll fill in the exact Lv 75–100 skills the moment a Season 3 account can confirm them. If you're there, send a screenshot and we'll lock them in.
How to Spend Your Points (Every Season)
The order is the same every season — only how far you get down it depends on your cap and points:
- Seasonal EXP-snowball first (right column). Max the recurring EXP skills before anything else — they multiply your point income, so every later point arrives faster. These four are in every season's column: Combat Experience, Building Inspiration I, Double Exchange, Professional Insights (see the note under the seasonal section below).
- The permanent Engineer core. Max the economy package first: Rapid Production → Build for Free / Research for Free → Build Now / Research Now → Resource-Saving / Recycling (these are already reached by Lv 35, covered in the S1 guide). This is the whole reason to be Engineer and it never stops being the priority.
- The higher core tiers (Lv 45–70), as your cap allows. Best value first: Efficient Gathering (Lv 60) and Instant Gathering (Lv 70) (more gather snowball) and Master Builder (Lv 65) (build speed), then Monster Tracking (Lv 70) and First Aid Expert (Lv 60). The mine/defense nodes (Drone Supply, Fearless Defense, Durability Mine) are off-role for a growth build. (Lv 75–100 tiers are Season 3+ and not yet in-game verified — see the note above.)
- This season's signature seasonal skills (the themed right-column picks — listed per season below).
- Skip / defer, then reset at cap. Skip the mine/defense nodes (Durability Mine, Fearless Defense, Enhance Siege Banner) unless you actively hold or hit bases. Once you're at the cap, the EXP-snowball skills have done their job — reset them (Skill Reset Book / season-end refund) into permanent value.
The Point-Spend — Season 2 (Lv 1 → 70)
You earn about one skill point per Profession Level (level-up milestones add a few extra — Season 1 totals 45 points at Lv 40, so Season 2 is roughly 75+ at Lv 70). Both tables below are the in-game-verified Lv 1–70 tree; the † seasonal skills are refunded at season end, so use the two in sequence.
The right-column seasonal points are refunded at season end, so they are not part of your permanent build — they're a temporary levelling booster. Use both tables, in sequence:
- While levelling → Version B (seasonal EXP skills first) — the fastest way to the cap.
- At max level → Version A (core only) — once seasonal refunds, this is your permanent end-state build. For Engineer that is a growth / economy build: build & research speed (Build for Free / Now, Rapid Production), cost recovery (Resource-Saving, Recycling), gathering (Efficient / Instant Gathering, Master Builder), plus the alliance Cooperative skills.
Version A — Final at-cap growth build (core only, seasonal refunded)
Shown in recommended fill order with each skill's unlock level; totals ~76 points (your Lv 70 budget). Off-role combat/mine nodes (Siege Mastery, Rally Rush, Medical Aid, Drone Supply, Durability Mine, One More, Support Boost, Battlefield Cleanup) are skipped on a growth build.
| Skill | Unlock | Pts |
|---|---|---|
| Rapid Production | Lv 1 | 5 |
| Outstanding Contribution | Lv 1 | 1 |
| Extra Meal | Lv 5 | 1 |
| Build for Free | Lv 10 | 5 |
| Research for Free | Lv 10 | 5 |
| Build Now | Lv 15 | 5 |
| Research Now | Lv 15 | 5 |
| Friendly Aid | Lv 25 | 5 |
| Cooperative Construction | Lv 30 | 2 |
| Cooperative Research | Lv 30 | 2 |
| Resource-Saving | Lv 35 | 5 |
| Recycling | Lv 35 | 5 |
| Efficient Gathering | Lv 60 | 5 |
| First Aid Expert | Lv 60 | 5 |
| Master Builder | Lv 65 | 5 |
| Instant Gathering | Lv 70 | 5 |
| Monster Tracking | Lv 70 | 5 |
Version B — Levelling route (seasonal EXP skills first, refunded at cap)
Spend the refundable † EXP-snowball skills first so you reach the cap faster, then the permanent economy core. At the cap the † points refund → respend into the growth skills above to reach Version A.
| Skill | Unlock | Pts |
|---|---|---|
| Combat Experience † | seasonal | 3 |
| Building Inspiration I † | seasonal | 3 |
| Professional Insights † | seasonal | 5 |
| Double Exchange † | seasonal | 3 |
| Rapid Production | Lv 1 | 5 |
| Build for Free | Lv 10 | 5 |
| Research for Free | Lv 10 | 5 |
| Build Now | Lv 15 | 5 |
| Research Now | Lv 15 | 5 |
| Resource-Saving | Lv 35 | 5 |
| Recycling | Lv 35 | 5 |
Recommended order under a ~1-point-per-level model; the seasonal † skills are refunded at season end so Version B converges on Version A's permanent build. Confirm exact point income and max levels in your own client.
Season 3 raises the cap to Lv 100 and adds five more tiers to the same core tree. Those exact skills and their spend order are not yet confirmed on a live account, so we're not printing a per-level Lv 71–100 route we haven't verified. The approach is unchanged — keep maxing the growth/economy skills as each higher tier opens. We'll add the exact Lv 71–100 tables once a Season 3 account can confirm them.
The Seasonal Right Column — Season by Season
The right column is shared with War Leader, different every season, and fully refunded at season end — so spend it boldly. Note the seasonal column is a linear chain — each skill unlocks the next, so you take them in order and can't skip any (even a cosmetic node gates the ones after it). This is confirmed for Season 2; the later seasons follow the same single-path structure. Because it all refunds, the only decision is how many points to sink into each: max the EXP and signature skills, and drop just 1 point into the filler/cosmetic gates to pass through. In every season, the same four EXP-snowball skills are the ones to max, because they multiply the profession EXP you earn and get you to the cap faster:
Combat Experience (more Profession EXP from World-Map monster kills), Building Inspiration I (more EXP from upgrading season buildings), Double Exchange (1:2 season-resource conversion) and Professional Insights (an instant chunk of your current level's EXP). These four appear in the seasonal column of every season — max each as it unlocks so the rest of the season's points arrive faster.
Season 2 — Polar World (frost)
The season's signature seasonal skills:
- Gather for Warmth — warm allies more efficiently (the S2 cold/warmth mechanic).
- Intense Overdrive — boosts the high-temperature Furnace Overdrive effect.
- Frostbomb / Frost Mine — drop a Frostbomb on an empty tile to slow the area, or deploy a Frost Mine trap.
- Firebomb — the offensive counterpart: drop it on an empty tile to raise temperature.
- Winter Wonderland — unlocks a new base skin (cosmetic).
Spend order (the right column is refunded at season end, so you can eventually max most of it — this is the order to invest as points come in):
| Seasonal skill | Max | Priority |
|---|---|---|
| Combat Experience · Building Inspiration I · Double Exchange · Professional Insights | 3/3/3/5 | ① EXP snowball — max as they unlock |
| Frost Mine | 3 | ② signature — ice-map control |
| Frostbomb | 3 | ② signature |
| Firebomb | 3 | ② signature |
| Intense Overdrive | 3 | ③ utility |
| Gather for Warmth | 1 | ③ utility |
| Winter Wonderland | 1 | ④ cosmetic (base skin) |
Season 3 — Golden Realm (desert / Protectors)
The biggest seasonal column (built around Desert Protectors):
- Sand's Protection — buffs heroes defending inside your Alliance Center range.
- Protector's Oath — instantly grants top-level Desert Protectors.
- Indomitable Will / Explosive Enhancement — Protectors that die on the march leave a stronger Death Shockwave.
- Fragile Spell / Shrinking Spell — when your Protectors beat an enemy base, they weaken/shrink it.
- Sandstorm / Nature's Touch / Double Greenification — terraform and area-control tools.
- Sandworm Trap / Trap Landmine / Summon Mummies — deployable traps and the commander-targeting Mummies.
Spend order:
| Seasonal skill | Max | Priority |
|---|---|---|
| Combat Experience · Building Inspiration I · Double Exchange · Professional Insights | 3/3/3/5 | ① EXP snowball — max as they unlock |
| Sand's Protection | 5 | ② signature — defender buff |
| Protector's Oath | 3 | ② signature — free Protectors |
| Fragile Spell · Shrinking Spell | 1/1 | ③ offense — weaken enemy bases |
| Indomitable Will · Explosive Enhancement | 3/3 | ③ Protector death shockwave |
| Sandstorm · Nature's Touch · Double Greenification | 1/1/1 | ④ terraform / area control |
| Sandworm Trap · Trap Landmine · Summon Mummies | 1/1/1 | ④ deployable traps |
| Contaminated Land Teleport · Double Conversion · Trade Discount | 1/1/1 | ⑤ utility |
Season 4 — Blood Night (Oni)
- Blood Night Hunter / Blood Night Hunter Teleport — become a Hunter when Blood Night descends, with a free teleport.
- Hunting Inspiration — earn extra Profession EXP while a Hunter (a season-specific snowball).
- Oni Summon and the electrician-themed Top Up EXP / Electrician Rally Call.
- Desert carry-overs (Fragile/Shrinking Spell), plus Flare / Lightfall / Disruption Mine area tools.
Spend order:
| Seasonal skill | Max | Priority |
|---|---|---|
| Combat Experience · Building Inspiration I · Double Exchange · Professional Insights | 3/3/3/5 | ① EXP snowball — max as they unlock |
| Hunting Inspiration | 1 | ② signature — extra EXP as a Hunter |
| Blood Night Hunter · Blood Night Hunter Teleport | 1/1 | ② signature — the Hunter transform |
| Oni Summon · Top Up EXP · Electrician Rally Call | 1/1/1 | ③ event utility |
| Flare · Lightfall · Disruption Mine | 1/1/1 | ④ area tools |
| Fragile Spell · Shrinking Spell · Summon Mummies · Trade Discount | 1/1/1/1 | ⑤ carry-over utility |
Season 5 — Wild West (High Noon / Fortune Train)
An economy-and-minigame column:
- Banker — extra interest from Bank Investments. Barista — faster coffee brewing.
- Gunslinger Wager — raises your High Noon duel deposit limit.
- Train Plunderer / Train Consigner / Train Protection — plunder more from, sell more on, and protect your Whiskey shipments on the Fortune Train.
- Free Advanced Teleport — a free advanced teleport on a cooldown.
Spend order:
| Seasonal skill | Max | Priority |
|---|---|---|
| Combat Experience · Building Inspiration I · Double Exchange · Professional Insights | 3/3/3/5 | ① EXP snowball — max as they unlock |
| Train Plunderer · Train Consigner · Train Protection | 2/1/1 | ② signature — Fortune Train economy |
| Banker · Barista | 3/2 | ③ passive income |
| Gunslinger Wager | 1 | ③ High Noon duels |
| Free Advanced Teleport · Fragile Spell · Shrinking Spell · Trade Discount · Summon Mummies | 1/1/1/1/1 | ④ utility / carry-over |
Season 6 — Rainforest (fishing / territory)
- Multi Fishing / Golden Bait / Golden Fish Chest — the S6 fishing loop (better catches, golden bait, better chest odds).
- Extra War Merit — extra War Merit when donating your catch to Alliance/Faction tech.
- Homeland Attack / Homeland Defense — hero ATK/DEF when your base sits in your faction's territory; Invasion Attack / Invasion Defense — the same when your base is in enemy territory.
- Ruins Expert (higher Ruins Treasure deposit), Buddy Fortify, Rainforest Style (base skin).
Spend order:
| Seasonal skill | Max | Priority |
|---|---|---|
| Combat Experience · Building Inspiration I · Double Exchange · Professional Insights | 3/3/3/5 | ① EXP snowball — max as they unlock |
| Homeland Attack · Homeland Defense | 3/3 | ② combat — base in your territory |
| Invasion Attack · Invasion Defense | 3/3 | ② combat — base in enemy territory |
| Extra War Merit | 5 | ③ rewards — donate your catch |
| Multi Fishing · Golden Bait · Golden Fish Chest | 1/1/3 | ③ fishing loop |
| Ruins Expert · Buddy Fortify · Trade Discount · Summon Mummies | 1/1/1/1 | ④ utility |
| Rainforest Style | 1 | ⑤ cosmetic (base skin) |
Related Guides
- Engineer Profession Tree (Season 1) — the Lv 1–40 S1 walkthrough
- War Leader Profession Tree — Seasons 2 to 6 — the combat counterpart's extended tree
- Profession System Guide — Engineer vs War Leader, switching, and the level cap by season
- HQ Progression Guide — the building track Engineer accelerates
- Tech Centre Research Guide — research priorities Engineer accelerates