where does graves get all his sustain from?

warlord's bloodlust

Maw gives LS when it procs, DD gives hp back when he Q's and ults.

You would be surprised how healthy you can be after you give up smoking XP

Each of Graves's basic attacks consumes 1 shell and sprays 4 pellets in a cone. Enemies hit take 70 - 100 (based on level)% AD physical damage plus 「 a third of that damage 」 damage for every pellet that hit them beyond the first. Critical strike icon Critical strikes spray 6 pellets over a 50% wider cone and deal 40% × (1 + bonus critical damage) AD additional physical damage.

So a lvl 6 graves with just Vampiric would have 85AD (excluding all runes/masteries). so an AA will do 76% AD per pellet + 25% AD per pellet past the first. This translates to 64.6 + 63.75 if 4 pellets hit a single target or 128.35 damage. When hitting 4 targets, its 258.4 damage over those 4. 2 targets with 2 pellets each, 171.5 damage total.

Hopefully that helps show where it comes from (since vampiric gives 10% LS i felt i didnt need to post those values)

Frontloaded damage + lifesteal

graves got all his power from riot balance team ( ͡° ͜ʖ ͡°)