I am old school D&D and this is where my inspiration comes from.

Ice Wizards.

Passive Skills:
Ice Armor: Grants the user 5/10/15/20% Damage reduction from attacks. Also turns the user a light blue on the 4th level.

Ice Shards: When attacked, there is a 5/10/15/20% chance that shards will fly off of the armor and half blind the attacker.


Activated Skills:
Ultimate: Freezes a person in place (turning them blue) for 1/2/3/5 seconds. Countdown 30 seconds.

Blizzard: The wizard drops a circle on the ground (admin beacon) that causes half-blindness while inside the circle (like the SM admin command).