Hi, it's me again.
This time i brought to you the crazy 1 shot boomerang monster.
end of introduction lul

well, since we are running this monster a very serious AD build, we need to make it an actual AD. Runes are picked like that in order to maximize the damage in both team fight or 1v5

well, since all gnar abilities are regarded as AD, why not give this little mother sucker a lethality :) you basically hit the enemy with your Q or passive from W and there goes half the enemy's HP