The caster marks a corpse with a magical “signature”, that identifies them (truthfully or falsely) as the murderer. Some assassins use this signature as a sort of calling card, while others use it as a way to prove that they got their pay. The signature can take any form, for example: a specific expression on the face, a rune, a word inscribed in the corpses flesh, a discolouration of one eye, and so on.
Any magic used to reveal you as the killer either automatically succeeds if you truthfully identified yourself, or fails automatically if you falsely identified. If the caster uses a spell such as speak with dead or contact other plane, they can make an arcana check against your spell casting DC, being able to identify the true murderer on a success.
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