It's mostly the soulshield. I think the rest of your gear provides enough damage for what you're looking to do. You probably have trouble surviving right?
Besides learning mechanics, you can up your HP value with better soulshield. Here's some tips on getting better ones.
1) Buy profane essences and spin the wheel. 20k HP.
2) Use Moonwater valor stone and trade it in at the Hogshead vendor for heroic moonwater soulshield. 24k HP
3) Run 6 man e.fleet for soulshields. 20-24k HP with better stats
Can also purchase soulshield using siren emblem, from vendor. 2 siren emblem = 1 soulshield of choice.
Can acquire emblem doing dailies. 6 man and 24 man.
4) Run 6 man bloodshade for soulshields. 30-35k HP + better stats.
Can purchase soulshield with pirate emblem from vendor. 2 pirate emblem = 1 soulshield of choice.
Can acquire emblem doing dailies. 6 man and 24 man.
5) Any soulshield post lvl 45+ should give you decent HP value of +25k HP.
6) There's also the PVP soulshield, acquire from fraction in misty woods. I never tried to get them so I don't know how. You can look it up. 20-25k HP with nice PVP utility.
Side note: All soulshields e.fleet and up give a random combination of stats.
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