So I have written this script:
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Scriptname powerfulundead extends ActiveMagicEffect


Event OnEffectStart(actor akTarget, actor akCaster)
If (akCaster.hasperk(necromancy))

akTarget.forceav("health", 1)
akTarget.modav("magicka", 50)
akTarget.modav("stamina", 50)
akTarget.modav("speedmult", 200)
Debug.MessageBox("Is THIS WORKING?")

endIF
endEvent

perk property necromancy auto
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The script compiles, but in game something weird happens: The effects effect my character, not the target. I know that the walrus I am testing this on does not have the perk "necromancy", so it obviously recognizes me as the caster. So why does it effect me as the target as well. I have been struggling with this ONE SINGLE PROBLEM for two days now. Any help?

Are you using a modified version of one of the dead raising spells? Part of the spell affects you. The same happens with summon spells. I didn't dig too much in this, but I suppose you will have various effects when opening the script. Edit another one.

I'm not sure how to use debug text like this exactly but I've seen it in other scripts...
you should be able to get the debug text to tell you the target of the script as well

try using something like

Debug.MessageBox("this spell targeted" + akTarget)

also, why not just use another magic effect with a conditional to achieve that(like the vanilla spells do with DarkSouls perk)? I'm not criticizing, it just seems like a simpler solution

I just tried your idea, using

Scriptname powerfulundead extends ActiveMagicEffect Event OnEffectStart(actor akTarget, actor akCaster)	    akTarget.forceav("health", 1)	    akTarget.modav("magicka", 50)	    akTarget.modav("stamina", 50)	    akTarget.modav("speedmult", 200)	    Debug.MessageBox("Is THIS WORKING?" + akTarget) 			 endEvent

and equipping it on a new magic effect with the conditional of HasPerk necromancy == 1, then equipping that onto the reanimate corpse spell, but it didn't work. I have no clue why, but that does seem like the better approach than what I was doing. Sometimes the best solution is the simplest, eh?

I finally got the above method to work by checking the Recover, No Death Dispel, No area, and the Hide in UI boxes in the magic effect box. I'm not entirely sure why that fixed it though....