Nice and simple to use.
Flames of Oblivion is your main spammable and also with the reaving blows passive you heal yourself as well.
Build up 3 stacks with Flames, pop coag heal, pop corrosive (your coag heal should mask the green glow from coag making it harder to spot) pop Shattering Rocks for stun and heal then finish with a damaged boosted whip/lash.
Keep lashing if they are low health or peel back and rinse and repeat process.
Use vigor for defence buff and heal over time but it is also a good flex spot for skills like race against time, noxious breath, enpowering chains, protective plate and are all great options.