Not a meta build
Feast on a bunch of enemies, Nourish with any bonus you like, vomit, rinse and repeat.
Equip a decaying dragon key (so you have 18 shields), and equip [Augur Pact] on your 2nd Weap.
Congrats, everytime you use Nourish to heal and buff, you get a free shield gate.
I chose Defy to further buff armor and add more i-frames, as 2nd panic button (If you've eaten many guys already and there's no time to vomit).
This build is meant to reinforce his tankiness, needs a AOE Weap to fast sweep groups while you feast and vomit as usual.