Well, for those that are having trouble with this kill in particular:
- Clear out the rest of the mobs in the end area, less distractions == better.
- Walk Lucion out towards the area Malic is chilling in, don't use mind control yet. Once you're certain Lucion is in Malic's sight (i.e. you got him outside in the same area as Malic or he's standing in a spot where Malic can shoot at you, mind control.
- If you're still in Malic's vision, you can either position yourself to make malic hit lucion by standing between them, OR break sight and his aggro will target Lucion instead. Lucion should also try going for Malic here.
- Kill off any deathbats that get spawned, but if there's a few that aggro onto Lucion, let them keep him from moving. Focus on keeping him charmed as each charm wears off.
Consistently a 5-10 minute kill once you get down the mechanics.