The same mentem one can trigger them all, provided they have a linked trigger in each of them.
Mentem thought readers work quite well, only downside is they tend to be constant effects, and thus cause warping. I was planning on making a semi autonomous item that constantly read my mind at arcane connection.. .. until I realised that I'd be getting about 8 warping a year from it.. heh
You mean that because the spell is, technically, giving the Talisman/Item the magical senses, it should warp that item, not the mage that it reads?
Makes some sense. The mage certainly isn't able to read any mental commands. Otoh, the mage is unquestionably the beneficiary of the spell, and effectively the "caster", and is certainly within the effect, so...
Dunno. Sounds like both are warped BTR, but it's hardly clearcut.
However, folk should remember 3 things-1) If an item, even a Talisman, "senses" stuff, the mage doesn't unless they then sense that item. So a wand that "hears" stuff isn't of much good to the mage unless s/he can talk to the wand. (an interesting premise...)
As mentioned above, for a Talisman, the InMe effect is only 25, so it doesn't have to trigger Warping (but is close, SG decision, natch.)
These rules (p 167-8 & etc) are not cut and dried. They specifically state that " 'Powerful effect' is subjective"- so the SG/troupe should use their best judgment at all times.
Whether the spell benefits a person is irrelevant, if it's a constant magical effect on them, they'll get warping. What you're thinking of is for the item to be able to read minds by its own power, which is using a personal range and one of the sense modifiers.. that would be a spell that was effecting the item.. a general InMe mind reader is cast on an individual target, not yourself.. so the target gets the warping.
Oh, and yes, you -could- use range personal on the InMe of a talisman, but then it can only read your mind while you're touching it, which might be a quite big drawback, depending what you want it to be doing.
And actually, in that specific case, the item has to be the caster really, otherwise it won't have anything to go with the linked triggers, and the mage would gain the dubious ability to read his own thoughts.. which.. .. might actually be interesting if it included subconscious stuff ^^
Oh, and the self developed effect only helps with the powerful effect causing warping Brutus, not constant warping
Well, actually.. if the spells got through.. it's got through.. and it'll last for whatever it's duration is.. you can't put up parma -after- someone's changed you into a frog and turn back.. or at least, we don't play that way.. it would negate a lot of the weaknesses of parma, which are few at that
in regards to warping, instead of constant duration you could easily do sun duration without the environmental trigger or item maintains concentration. You could then turn on your brain reading power whenever you thought yourself to be in a risky situation (such as whenever you leave your covenant). This would lead to times when you couldn't accesses the powers but it would also save you from warping.