Unfortunately, I going back to a save game before the bug occured would loose a lot of game time. Is there a way to get rid of this spell? I realized that the effect is active only because my conjuration level is constantly increasing. I also tried to use the reanimation spell again on another corpse, but this had just the effect that I had two spells 'Reanimation' active.

I tried to remove the 'Reanimation' spell, with player.removespell xyz, but this did not help, and the effect still lasts. While Bioware has not provided any official modding tools, the community found a way Legendary Explorer (LEX) is a developer tool kit for ME:LE created and maintained entirely by fans of the series. Using the console command 'dispelallspells' works, but I don't want to use this because I have a lot of other effects, partly from mods, and I don't want to add them all manually again, and I am unsure about this command and its effects in general. Mass Effect Legendary Edition dropped in May and since then almost 400 mods, saves and presets have already been shared with the community. The remaining time of the 'Reanimation' effect is currently shown as 998 days.

Now I can not get rid of this effect any more.

My character has an active effect 'Reanimation', which probably originates from a reanimated corpse that somehow vanished, seemingly due to a bug (the 'Reanimation' spell is probably from Skyrim Redone).

Skyrim hd spell effects