I’m splitting Morden in two, and Nobody Can Stop Me.
Survivor Morden (aka, Morden, minus Death Curse)
Shadow Cloak, makes himself and other survivors invisible, uncertain of duration and cooldown.
Trap Blast, makes a small, somewhat difficult to see magic circle on the ground, the killer is slightly damaged, and has their vision (and maybe hearing) impaired when they approach it.
Passive, for every survivor that has died, Morden and survivors close to him are quieter. If Morden is the last survivor, abilities that reveal his location no longer work.
Killer Morden (aka, the Death Curse, minus Morden, sorta)
M1: Death Magic M1s, probably.
Abilities: Flying. Morden flies, moving faster and being able to ignore some obstacles while this is active.
Cloud of Death. That thing he did when clashing with Julian. A bit of windup, before he creates a cone of death, which should deal severe damage to survivors.
Sense. Morden gets to tell where people are. He cannot use his other abilities while doing so, or for about a second after cancelling.
Passives: Morden doesn’t exactly take a lot of damage, being a Curse User. Let’s say 80% less from sources that don’t specifically ignore resistances.