[Sorcery] Are buffs obvious to the subject?

[malloyd]

Originally Posted by Crystalline_Entity

According to GURPS Thaumatology: Sorcery, buffs have "No Signature" so they're not obvious - I'm assuming that this means that there's no evidence to a third party that a spell was just cast. However, I was wondering whether it was obvious to caster and subject when a buff effect was wearing off?

I'd say it doesn't have to me, but it would be a completely trivial thing to build into the spell. You can't have it both ways at once, but designers choice which. There are times when it could be useful to buff somebody without letting them know, and any sort of index that told them how long the effect will last does automatically give away the presence of the effect.