The Ascendancy skill tree is a small skill tree that a character has access to when the Labyrinth has been completed. Each Ascendancy class has its own tree. It functions similarly to the larger passive skill tree; the player earns Ascendancy skill points, which can be spent on allocating nodes granting passive bonuses. The Ascendancy skill tree is shown on the regular passive skill tree, near the character's starting location.
Ascendancy passive skills are significantly more powerful than regular passive skills, and will heavily impact the way a character is played. A character can only spend a maximum of six points on the tree. The skill trees - disregarding the Ascendant's - also follow a certain format. There are generic, lesser nodes and potent "notable" skills. Most notable skills are gated behind one lesser node, so it takes two points to reach them. The most powerful notables require the player to allocate another notable first, so they take up four points. Due to the skill point limit, a character can not have more than one four-pointer and will have to make a choice; either get three two-pointers or one four-pointer and one two-pointer.
Refunding one Ascendancy skill point requires five regular refund points. When all points are refunded, rerunning the Labyrinth allows the player to change the Ascendancy class chosen for free.