this sounds like you would rather like to get a book of secrets and learn the elf-racial skill which absorbs a LOT of damage
for grinding use high bloodlust, nothing better
in supportaspect you then have 5 skills for max. tankspec:
1 psychic shell
2 astral body (with rubies!)
3 concentration with purificationruby (remove negative effects)
4 meditation with ruby to have more defense (horror for those who use burstdmg!)
5 bloodshield from summoner (why not paladinshield? because palashield can be onehit while summonershield cant)
passive abilities not listed here
psi can tank a lot of damage if done correctly