Spells that do not offer saves.

[ceremony]

The path most often subject to MR is Astral. However, many spells do not check against magic resistance. The MR list in the Grimoire was generated directly from the game code, so there should not be a lot of omissions, if any. You can usually correlate the MR/lack of MR to the in-game spell description.

[Shovah32]

Life for a life is a very powerful single target spell, great for taking down alot of big things since it cant be resisted and can (iirc, cant remember casting level) possibly be spammed.

[Frostmourne27]

It's very high level, but quite easy to cast. MUch like blood vengance or disintigrate. Blood magic looks abit more palatable for things other than unique devils.