Hello, i'm Fyndler and this is my guide on Jaina. I now play this hero as main and doing very well with it, with this build i get very high burst damage and almost never runs out off mana.

[This guide is still under development, thanks for understanding]

Pros:
-Great Damage
-High Burst
-Good AOE
-Almost never runs out off mana

Cons:
-Squishy
-High Priority Target
-Made of paper

This is the setup i run for Jaine right now

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Winter's Reach - Increases the range of Frostbolt by 30%

Cost: 30 Mana
Cooldown: 4
[Q] Ability

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Arcane Intellect - Dealing damage to a Chilled target returns Mana to Jaina. Basic Attacks return 5 Mana and abilities return 25

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Ice Lance - The cooldown of Frostbolt is reduced by 2 seconds if it impacts a Chilled target

Cost: 30 Mana
Cooldown: 4
[Q] Ability

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Summon Water Elemental - Summons a Water Elemental at target location, dealing 65 (+7 per level) damage and Chilling nearby enemies. The Water Elemental's Basic Attacks do 50 (+6 per level) damage, splash for 25% damage and Chill

Cost: 75 Mana
Cooldown: 80
[R] Ability

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Icy Veins - Activate to make your Basic Abilities' cooldowns recharge three times as fast and reduce their Mana cost by 50% for 5 seconds

Cooldown: 60
[Activate] Ability

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Ice Barrier - When Jaina does increased damage from Frostbite, she is shielded for 25% of the total damage dealt. This Shield lasts 3 seconds

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Bolt of the Storm - Activate to teleport to a nearby location

Cooldown: 40
[Activate] Ability