this is my build and I do pretty well with it:
gear:
5 piece "of the sun" there are all major/minor armor pieces and a neck piece
2 piece worm cult
3 pieces healer
weapon 1
weapon 2
here is my loadout/build sheet
my build
The main thing to note here is this is 100% a ranged build. Melee will jack you up if you let them.
How to play this build:
1. always keep molten, wings and gdb,combat prayer and healing ward up on cooldown.
2. your have 3 offensive abilities heavy attacks/crushing shock/dragon leap
If at range:
buff: (combat prayer, Degeneration, molten, healing ward, engulfing) then heavy attacks cancelled with crushing shock until they are dead. Re-buff if you need to, but you won't need to really.
Volcanic rune is your best friend for melee enemies. Cast it on a group of people and watch them break around it, cast it on someone on siege, cast it on yourself and stand in the ring while reflecting ranged and any melee that runs up on you will be popped up.
I use dragon leap to close the gap, then drop engulfing flames cancelled with a dodge roll backwards.
Then hit them with degeneration and buff molten and combat prayer, this will give you (5% increase from gear, 10% increase from engulfing, 20% from degeneration, 8% from combat prayer) a massive amount of damage lol.
Barrier is your oh crap moment, its a huge heal as well as a shield, use it whenever you can. Conversely you can swap out for corrosive armor for even more damage, but I prefer barrier.