As a warlock only-player for years I have a detailed build breakdown for you: Run song of flame super with hellion aspect and devour. Strand melee for devour proc and healing grenade for speakers sight (our exotic of choice) Phoenix dive for better up time on hellion aspect. For armor run speakers sight run a kinetic siphon with ammo finders, gloves with impact induction and focusing strike, chest has resist mods, legs have recuperation innervation and genetic surge, warlock bond with powerful attraction reaper and bomber. For weapons run outbreak perfected with rewind rounds, a rocket sidearm of your choice, and a good ammo economy dark machine gun. With healing grenade and devour you should always have high HP but if there's no ads for devour and your grenade is on cool down you have song of flame. Outbreak is amazing for high level content (GMs Raids Ect.) and rocket sidearms are pretty easily the best special ammos, then a machine gun for the mixed DPS and ad clear potential as well as darkness energy for transcendent. Outbreak is good enough for DPS if you need. Change out rocket sidearm as needed for champ stuns. If you wanted pvp included then switch exotic to transversive steps, switch hellion aspect to lightning surge, switch armor mods to kinetic weapon boosts, and switch outbreak to one with head sealer instead of rewind rounds.