Zed Skill Tree that Unlocks with Level Progression and Damage Counter

It is unlikely that an EXP based skill tree would be implemented for Zeds, because players cannot selectively spawn as a certain type of Zed. But it is possible to create a skill tree that unlocks with wave progression and activates when a Zed player accumulates enough points (Zed players have independent points).

This would even out the scales as the game progresses: say if it is against a team of 6 level 25 players, a good Zed team would have unlocked tier-5 skills at wave 8, something that compensates for Zed time skills.

To also compensate for Zeds being overpowered against lower level or skilled players, perhaps harming lower level players gives less points than high level players, or Zeds also lose some points for dying and dropping a tier in the skill tree is possible.

Zed Skill Tree that Unlocks with Level Progression and Damage Counter