Abilities of Gnar
Spell skill priority is an important winning factor for Gnar. Understanding the abilities of Gnar in League of Legends is another. Below you can find all the relevant information on Gnar abilities. In order for item builds you should check the build for Gnar.
Passive: Rage Gene
While in combat Gnar generates Rage. At maximum Rage his next ability will transform him into Mega Gnar, granting increased survivability and access to new spells.
Boomerang Throw / Boulder Toss
Gnar throws a boomerang that damages and slows enemies it hits before returning to him. If he catches the boomerang its cooldown is reduced.Mega Gnar instead throws a boulder that stops on the first unit hit, damaging and slowing everything nearby. It can then be picked up to reduce the cooldown.
Mini Gnar: Gnar throws a boomerang that deals spell.gnarq:minitotaldamage physical damage and Slows by spell.gnarq:slowamount*100% for spell.gnarq:slowduration seconds. The boomerang returns after hitting an enemy, dealing reduced damage to subsequent targets. Each enemy can only be hit once. Catching the boomerang reduces its Cooldown by spell.gnarq:minicdrefund*100%.
Hyper / Wallop
Gnar's attacks and spells hype him up, dealing bonus damage and granting him Move Speed.Mega Gnar is too enraged to be hyper and instead can rear up on his hind legs and smash down on the area in front of him, stunning enemies in an area.
Mini Gnar Passive: Every third Attack or Ability on the same enemy deals an additional spell.gnarw:minitotaldamage plus spell.gnarw:minipercenthpdamage*100% max Health magic damage and grants spell.gnarr:rhypermovementspeedpercent% Move Speed decaying over minihasteduration seconds.
Hop / Crunch
Gnar leaps to a location and bounces off the head of any unit he lands on, traveling further.Mega Gnar is too large to bounce and instead lands with earth-shattering force, dealing damage in an area around him.
Mini Gnar: Gnar leaps, gaining spell.gnare:minibas*100% Attack Speed for spell.gnare:miniasduration seconds. If Gnar lands on a unit he will bounce off it, traveling further. Bouncing off an enemy deals spell.gnare:minitotaldamage physical damage and briefly Slows by spell.gnare:movespeedmod*-100%.
GNAR!
Mega Gnar throws everything around him in a chosen direction, dealing damage and slowing them. Any enemy that hits a wall is stunned and takes bonus damage.
Mini Gnar Passive: Increase Hyper's Move Speed.
Mega Gnar: Gnar tosses nearby enemies, dealing damage physical damage, Knocking Back, and Slowing them by rslowpercent% for rccduration seconds. Enemies that hit a wall instead take walldamage physical damage and are Stunned.
FAQ on Gnar
What do you max first on Gnar?
Most Gnar pros max out 
Boomerang Throw / Boulder Toss first.