PandoraSims has downloadable, new spells. Some of them drains other sims of their motives, aand it says that at least one spell should be able to kill other sims(req the Seasons exp.)
It's a 18+ site which hosts/used to host a lot of pay content, and I don't know how safe it is so be careful before going there.
Their sims 2 files can be found on the booty though. Click on "spells_full.zip" to download all of the spells.
https://www.pandorasims.net/sims2_o..._sets_fant.html