Any tips for dealong with this elite I can`t seem to nail him

I`m having great difficulty defeating mobs that self heal whats the best way to deal with them ta

I`m a mercenary didn`t know you could do that tell me more please

just can`t do this mission The boss seems to just carry on healing all the time and so I can`t touch him even though he does little damage also I get bumped back to the start of the mission any help would be appreciated

Hi I`m a lvl 14 jedi knight and can`t defeat lord tarnis so I figured I`d try and level up a bit then take him on but I haven`t been able to find any more missions to do and I don`t fancy just grinding my way up any advice would be much appreciated ta