Ascendancy

PoE's sub-class system, added in the 2.2 expansion (2016). Mid-campaign you complete the Labyrinth — a trap-filled multi-room dungeon with a boss (Izaro) — and unlock an Ascendancy class with its own small skill tree (~8 points).

Structure

Each base class has 3 ascendancies. PoE1 currently has 19 ascendancies across 7 base classes:

Base class	Ascendancies
Marauder	Juggernaut, Berserker, Chieftain
Duelist	Slayer, Gladiator, Champion
Templar	Inquisitor, Guardian, Hierophant
Witch	Necromancer, Elementalist, Occultist
Shadow	Assassin, Saboteur, Trickster
Ranger	Deadeye, Raider, Pathfinder
Scion	Ascendant (one option, hybrid)

The ascendancy tree is small — typically 8 nodes for a 4-times-completed Lab — but the nodes are dense. A single ascendancy notable can do what 4–5 main-tree notables would: "Inquisitor: Inevitable Judgement — your hits ignore enemy elemental resistances." Builds are defined by ascendancy.

Why Ascendancy is the cleanest gating in PoE

Of all the gating in the game (RNG drops, RNG sockets, RNG affixes, RNG influenced bases, RNG league mechanics), ascendancy unlock is the only major gate that's a pure skill check. You don't roll for it. You don't trade for it. You run the Labyrinth, you fight Izaro, you survive his trap rooms, you take your points.

The community has a long-running love-hate with the vehicle (the Labyrinth is widely disliked — repetitive traps, randomized layout, no relevant loot beyond ascendancy points), but the payoff is universally praised. The first time your character takes their second ascendancy point and a build clicks together — that's the moment most builds become themselves.

Identity over flexibility

PoE1 lets you re-run Normal Lab + spend respec currency to swap ascendancy. It costs effort, but it's possible. PoE2 explicitly removed this flexibility — once you pick, you're committed for that character. GGG's stated reason: ascendancy should be identity, and identity that's swappable isn't identity.

This is a clear case of GGG seeing PoE1's drift (everyone respecs ascendancies between metas) and walking it back in the sequel. See PoE2 design tensions for the broader pattern.

Compared to other ARPG sub-class systems

Game	Sub-class moment	Cost
Diablo 3	None — class skills with rune slots	n/a
Diablo 4	None at sub-class level; Paragon board is post-campaign	n/a
Last Epoch	Mastery at level 20+; one-way commit, no Lab-style trial	Pure level gate
Grim Dawn	Pick second mastery at any time; tree-based	Free at any level
PoE 1	Labyrinth completion mid-campaign, 4 stages of difficulty	Skill check (Izaro + traps)
PoE 2	Trial of the Sekhemas (skill check) or Trial of Chaos (rng); 3 ascendancies per class	Skill or RNG, depends on trial

PoE's "earn it through a skill check" framing is unusual. It's the only major gate in the game where a 30-hour casual player will fail and a 30-hour skilled player will succeed — and the player can tell which they are.

Patterns this exemplifies

• bonus-with-drawback — committing to an ascendancy forecloses 2 others; the build ramifications are large.
• earned-identity-gating — the gate is skill-based, not RNG. A small but distinct pattern: "the most identity-defining decision in the game is the one you genuinely earn."