Challenge Leagues
Challenge Leagues are seasonal content releases that introduce new mechanics and Path of exile currency challenges:

Leagues: Temporary game modes that reset every few months, providing a fresh start and new mechanics to explore. They offer Standard, Hardcore, SSF, and Hardcore SSF variants.
Affliction League: For example, introduces new content and mechanics, with characters migrating to eternal leagues (Standard, Hardcore, etc.) after the league ends.
Leagues keep the game fresh, encourage building new characters, and provide a reset economy.

Character Classes
PoE 2 features 12 base classes, each representing different attribute combinations:

Strength: Marauder (Axes), Warrior (Maces)
Dexterity: Ranger (Bows), Huntress (Spears)
Intelligence: Witch (Minions/Occult Spells), Sorceress (Elemental Spells)
Strength/Dexterity: Duelist (Swords), Mercenary (Crossbows)
Intelligence/Dexterity: Shadow (Daggers and Traps), Monk (Unarmed and Quarterstaves)
Strength/Intelligence: Templar (Flails), Druid (Shapeshift Spells)
Each class starts at a unique position on the passive skill tree, providing different strategic advantages. Classes are not limited to POE currency their signature weapons or abilities; you can customize them extensively.