T1 mod: Freeze
Add a slow effect to your weaponry but reduce burn damage and prevent Candescence mod tree
T2 mod: Stun Blast
When you crash head on a iced enemy, you create a blast that stun all enemies in a small radius for a few seconds. When an enemy die with it slowing effect, it leave a little area during a few seconds that slow enemies.
T2 mod: Permafrost
Increase hit damage on iced enemies and slowing effect can be accumulative
T3 mod: Absolute Zero
Icing an enemy has a chance to completely freeze them. Destroying the frozen enemies shatters them, releasing clusters of ice in few directions that can damage other enemies.
(And if you take the burn tree, it prevent Ice mod tree eyes)