This build is useful for volibear because his second skill is based on 15% of his HP. So, the more hp you get, even more you'll hit. 15% of 7000 equals to 1050, PLUS the base hit, which is 260. So he'll hit 1310. That doesn't count the passive of the Warmog's armors, which you get 350+ each warmog, 350 x 5 = 1750. So 7000 + 1750 = 8750, 8750 x .15 (15%) which is 1312, 1312 + 260 = 1572. So, you'll own the game.