Keystone idea

4 new exclusive keystones (you take one the othet three are unusable)

Avatar of fire
you take (1/2 player level) per second fire damage
you deal (player level) damage to any enemy that strikes you
You are immune to ignite and burning (you are already on fire)
(Animation) always burning.

Avatar of ice
movement speed and attack speed are slowed by (1/4 player level %)
Enemies who strike you have a (1/2 player level %) chance of being chilled
You are immune to being chilled or frozen
(Animation) Icy footsteps

Avatar of Lightning
You take (1/2 player level) lightning damage per second
you have a (1/4 player level) chance to shock enemies who strike you
You are immune to shock
every 5 seconds you spawn a spark

Avatar of Chaos
you take (1/2 player level) chaos damage per second
you deal (player level) per second chaos damage to enemies behind you
chaos damage does not ignore energy shield
(Animation) trails a green haze.

I always likes new ideas.

I only see a problem with this and ES as the ES will then never replenish as you always will take damage.

There's also the fact that no keystone scales directly with level. Or anything really.

These make sense more as skills than as keystones.