As a FS cleric your not suppose to be realy tanky and the salamander flames will do most of the healing job for you, just make sure you have some PVM resistance, thats the most importent stats for pvm.
Its also HEAVLY advised to take the unique integity skill this gives 50% damage reduction to the target for some seconds.
Brave armor does a realy good job in dungeons for all classes a backshield is also advised, maybe some oro/cliff for def, but I usualy have Beautiful set (Beryl7) with Hiria's Tear (Beryl7)
Its always good to have multiple sets available for multiple situations, u cant swap gear in combat but that doesnt mean u can't be prepaired 
The fastest and easy way is normal gems,
Body: Damage reduction
Offhand magictool: block rate gem 4,5%
Head: uhhm 80 healpower
Boots: damage reduction or move speed
Weapon: Beryl 7
ring/earring: Beautifull (B7) or Cliff/Oro (Amethyst 7) for def mode.
Necklace: Hiria's tear is kinda the best one for every class. Should get this asap
2x Backshield: 2x advised +15 a 30Charm 50ms is nice and/or Summon gem for more Salamander flames.
The better and longer way is the paradigm runes.
Edited by Cortiz, 19 November 2016 - 10:38 AM.