Water Nova Effect
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Water Nova Effect is an alternate skill effect for 
Ice NovaIce NovaSpell, AoE, Cold, Nova
Level: (1-20)
Cost: (8-23) Mana
Cast Time: 0.70 sec
Critical Strike Chance: 6.00%
Effectiveness of Added Damage: 230%
AoE Radius: 30Requires Level 12A circle of ice expands from the caster.Deals (23-988) to (34-1481) Cold Damage
Base radius is (2.6-3) metres
Additional Effects From 1-20% Quality:
Base radius is (0.015-0.3) metresPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.
and 
Vaal Ice NovaVaal Ice NovaSpell, AoE, Vaal, Cold, Nova
Level: (1-20)
Souls Per Use: 25
Can Store 2 Use(s)
Soul Gain Prevention: 2 sec
Cast Time: 0.70 sec
Critical Strike Chance: 6.00%
Effectiveness of Added Damage: 120%Requires Level 12A chilling circle of ice expands from the caster, repeating from every enemy it hits.Deals (18-518) to (26-762) Cold Damage
Causes smaller novas up to 5 times on enemies hit
20% reduced Area of Effect each repeat
Base radius is 2.6 metres
Additional Effects From 1-20% Quality:
Base radius is (0.015-0.3) metresCorruptedPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.
.
It can be purchased in the shop for 10 points.