Gnar's abilities have no cost and are only limited by cooldowns. His secondary resource bar instead displays his Rage. Gnar starts by Mini Gnar form with 0 Rage.
Mini Gnar will generate 2-4 Rage whenever he deals damage to any source or takes damage from an enemy champion, plus an additional 4-8 over 3 seconds. If Mini Gnar has not dealt or received damage in the last 13 seconds, his Rage will start to decay. Rage generation from combat with minions is reduced. The over-time Rage generation cannot exceed 99 Rage from combat with minions if Mini Gnar kills the minion.
When Gnar reaches 100 Rage, he gains access to an alternate set of abilities. After either 5 seconds or upon casting an ability, Gnar will transform into Mega Gnar for 15 seconds while his Rage depletes. Once his Rage is exhausted, he will turn back into Mini Gnar and cannot gain Rage again for 13 seconds.
Gnar gains different bonuses based on his current form:
When returning to Mini Gnar, Gnar will only retain his current health percentage, not current health total. This is a conscious design change to prevent Gnar from simply triggering Rage Gene in order to heal himself over time.
COOLDOWN: 20 / 17.5 / 15 / 12.5 / 10
Mini Gnar - Active:Gnar throws his boomerang forward in a line, dealing physical damage and slowing all enemies hit for 2 seconds. Upon striking an enemy or reaching maximum range, the boomerang will slowly come to an end, travelling back towards Gnar in a fixed direction. Enemies beyond the first take only 50% damage and an enemy can only be damaged once.
The 60% cooldown reduction is calculated at the moment this ability is used, not when the boomerang is caught/boulder is picked up.
Because both abilities share the same cooldown, Mini-Gnar may pick up a boulder and Mega-Gnar may catch a boomerang.
The boomerang has a width of 60 on its way out, but increases to 75 on the return. The boulder has a width of 90 and flies faster than the boomerang.
Mini Gnar - Passive: Every 3rd consecutive attack or spell on the same target grants Gnar 30% bonus movement speed that decays over 3 seconds, and deals additional magic damage equal to a base amount plus a percentage of the target's max. health (capped against monsters).
If Crunch is the ability used to trigger the Rage Gene, Gnar will still be able to perform Hop's bounce. Gnar will apply Crunch's area of effect on both jumps, although enemies can only be damaged once.