I killed laikin first try although i am not an archer
although what i did was told sosostra to heal me and at lvl 17 (i think) i took damage but did not die and i was surrounded by enemy's pounding away at me and i just spammed magic missile. I play on the Xbox and it was hard to target Razekel But luckily magic missile never misses someone. Although I have very little Melee Protection (thats the most type of damage i received) as i focus on ranged and magic attacks for defense. So since arrows are slightly similar, OHH MOST IMPORTANT i used my CREATURE!
I suggest you try this. Have sosostra heal you. and summon your creature who will target liken i believe although the better target is Razekel as you have already damaged him in the previous battle.
I think if your health is around 200 you choose heal and use your creature and use your most powerful attacks trying to focus them on the demon you should succeed IMO. Although i dont know your stats i believe it is possible depending on how hard of a time you had in the islands in the first place as at the point i was I was able to kill them easily with a ;little strategy
(if all else fails and you just cant do it you can lower your difficulty level and on easy i am confident
