A unique challenge to the player's skill, where all three difficulties must be completed (by killing Baal) while limited to only one skill tree per difficulty.
A skill tree is picked before starting in Normal difficulty, and before advancing to Nightmare and Hell.
A respec to the chosen skill tree is required before advancing to Nightmare and Hell.
Once a skill tree has been used for one difficulty, it cannot be picked again for other difficulties.
For classes without three viable skill trees for damage the same skill tree can be picked multiple times, though with some restrictions.
Amazon, Assassin, Barbarian, Necromancer, and Paladin are the only classes this exception applies to.
A damage type, or skill, can only be picked once from a tree that is used multiple times.
Skills can be picked in supporting trees, such as Burst of Speed for the Assassin, or Vigor for the Paladin, but only once in total.
Pre-requisite skills, such as Corpse Explosion for the Necromancer, or Cyclone Armor for the Druid, can only be used once in total, and a choice must be made when to use it.
Skills granted from item bonuses are only allowed if present in the chosen skill tree.
The player is allowed to use skills through charges, even if the skill would be prohibited by any of the rules above.
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