hello i have a probllem please help

Hello I have a problem I have finished all quest for deatholme and I do not have the last quest in which I have to kill the boss I killed barefoot but I did not have a quest can you help me Quest is at the temples of the sun in ghostlands Does not appear and I have finished all 3 quests

If you have sunwell blade/orb then you have done the necessary quests, but I'm not sure about LEVEL requirement of last quest and if it has one, but the npc that gave you the quest to get sunwelblade/orb is the one that will give you the quest to kill dar'khan.