Ice

Ice is debuff, that stacking up to 1000 stacks

Target losing 1 stack every 0.01 sec. (1000 stacks = 10 seconds)

Target is stunned.

Fire and frost debuffs interaction
Applying Cold on target with Ice applying 40% of Cold stacks to Ice instead

Applying Ice on target with Cold removing Cold stacks and converts 40% of them to Ice

Applying Ice renews Burning to 5 seconds and reducing the Burning damage by 5 per stack applied

Target with Ice cant burn, removing 1 Ice for every 5 Burning applied, but reducing Burning for 5 damage per stack removed

Elementalist is very skilled in elemental magic and can apply Burning with Wet/Cold/Ice at the same time, without losing any stacks.