dont really need a raid for this task, a little creative thikning and positioning will make this easily a grp task
first once he is in zone keep him at ZI
pull the first few trash mobs just to get them out of the way, the 2 statics and 1 pather
once those are pulled, move him to the very first ramp down and stop him again, after a moment the Named spawns, kill the named, try not to agro hunter or his 2 guards
once you have done this have someone in grp other than the person with the task agro hunter and his 2 guards and run them to ZI (recomend makeing sure they are at least 97% as they do summon)
If the person who is doign the task gets agro, Use a chanter recuring blur to clear that agro on them, and then have someone do the step above
you May need to pull another single mob to get them to complete the task after you kill warlord, sometimes you do and sometimes you don't