Engineer Profession Tree — Seasons 2 to 6 (Lv 40→100 + Every Seasonal Column)
What This Guide Covers
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 → 100)
These are the tiers that open above the Season 1 Lv 40 cap. Season 2 reaches Lv 45–70; Season 3+ reaches the whole thing. Two headline skills per tier (the tree also carries minor filler nodes — the ones below are the picks that matter):
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, Professional Insights, Double Exchange (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, as your cap allows. Best value first: Master Builder (Lv 65) and Instant Gathering (Lv 70) (more speed/resource snowball), then One More (Lv 55) / One More Time (Lv 100) (extra free actions), the two Cooperative II (Lv 95) upgrades if your alliance still buddy-stacks, and the quality-of-life Free Teleport (Lv 75) / Truck Expansion (Lv 80).
- 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 Exact Point-Spend — Every Level (Lv 1 → 100)
You earn one skill point per Profession Level. These tables show exactly which skill to put each level's point into, all the way to the Lv 100 cap, with cap lines marking where each season stops. There are two versions — pick based on whether you're spending the shared right-column (seasonal) points:
- Core only — you ignore the seasonal column entirely and pour every point into permanent skills. Simplest, but you bank a few points early while higher skills are still locked.
- With seasonal first — you spend your first points on the seasonal EXP skills (†), which multiply your Profession EXP so you level faster, then flow into the core. Because seasonal points are refunded at season end, this is the recommended levelling path — you get the EXP boost, then reclaim those points into permanent skills. (
†= seasonal / right-column skill, refunded at season end.)
Version A — Core only (seasonal column ignored)
| Profession Level | Put your point(s) into | Pts |
|---|---|---|
| Lv 1–5 | Rapid Production | 5 |
| Lv 6 | Outstanding Contribution | 1 |
| Lv 7–9 | Yield Optimization | 3 |
| Lv 10–14 | Build for Free | 5 |
| Lv 15–19 | Research for Free | 5 |
| Lv 20–24 | Build Now | 5 |
| Lv 25–29 | Research Now | 5 |
| Lv 30–31 | Cooperative Construction | 2 |
| Lv 32–33 | Cooperative Research | 2 |
| Lv 34 | Yield Optimization | 1 |
| Lv 35–39 | Resource-Saving | 5 |
| Lv 40 | Recycling | 1 |
| ↑ Season 1 cap — Lv 40 | ||
| Lv 41–44 | Recycling | 4 |
| Lv 45 | Yield Optimization | 1 |
| Lv 46–50 | Resource Mining | 5 |
| Lv 51–55 | Efficiency Boost | 5 |
| Lv 56–59 | One More | 4 |
| Lv 60–64 | First Aid Expert | 5 |
| Lv 65–69 | Master Builder | 5 |
| Lv 70 | Instant Gathering | 1 |
| ↑ Season 2 cap — Lv 70 | ||
| Lv 71–74 | Instant Gathering | 4 |
| Lv 75 | One More | 1 |
| Lv 76–80 | Support Boost | 5 |
| Lv 81–85 | Win-Win Cooperation | 5 |
| Lv 86–88 | Free Teleport | 3 |
| Lv 89–93 | Battlefield Cleanup | 5 |
| Lv 94 | Monster Tracking | 1 |
| Lv 95–99 | Cooperative Construction II | 5 |
| Lv 100 | Cooperative Research II | 1 |
| ↑ Season 3+ cap — Lv 100 |
Version B — With seasonal EXP skills first (recommended levelling)
| Profession Level | Put your point(s) into | Pts |
|---|---|---|
| Lv 1–3 | Combat Experience † | 3 |
| Lv 4–6 | Building Inspiration I † | 3 |
| Lv 7–11 | Professional Insights † | 5 |
| Lv 12–14 | Double Exchange † | 3 |
| Lv 15–19 | Rapid Production | 5 |
| Lv 20–24 | Build for Free | 5 |
| Lv 25–29 | Research for Free | 5 |
| Lv 30–34 | Build Now | 5 |
| Lv 35–39 | Research Now | 5 |
| Lv 40 | Outstanding Contribution | 1 |
| ↑ Season 1 cap — Lv 40 | ||
| Lv 41–42 | Cooperative Construction | 2 |
| Lv 43–44 | Cooperative Research | 2 |
| Lv 45–49 | Resource-Saving | 5 |
| Lv 50–54 | Recycling | 5 |
| Lv 55–59 | Yield Optimization | 5 |
| Lv 60–64 | Resource Mining | 5 |
| Lv 65–69 | Efficiency Boost | 5 |
| Lv 70 | First Aid Expert | 1 |
| ↑ Season 2 cap — Lv 70 | ||
| Lv 71–74 | First Aid Expert | 4 |
| Lv 75–79 | Master Builder | 5 |
| Lv 80–84 | Instant Gathering | 5 |
| Lv 85–89 | One More | 5 |
| Lv 90–94 | Support Boost | 5 |
| Lv 95–99 | Win-Win Cooperation | 5 |
| Lv 100 | Cooperative Construction II | 1 |
| ↑ Season 3+ cap — Lv 100 |
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.
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. In every season, the first four picks are the same EXP-snowball skills, 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), Professional Insights (an instant chunk of your current level's EXP) and Double Exchange (1:2 season-resource conversion). These four appear in the seasonal column of every season — max them early so the rest of the season's points arrive faster.
Season 2 — Polar Storm (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 · Professional Insights · Double Exchange | 3/3/5/3 | ① EXP snowball — max first |
| 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 Kingdom (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 · Professional Insights · Double Exchange | 3/3/5/3 | ① EXP snowball — max first |
| 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 · Professional Insights · Double Exchange | 3/3/5/3 | ① EXP snowball — max first |
| 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 · Professional Insights · Double Exchange | 3/3/5/3 | ① EXP snowball — max first |
| 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 · Professional Insights · Double Exchange | 3/3/5/3 | ① EXP snowball — max first |
| 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