Telepathy as Mental Sense

[Xotl]

I have a character with Invisibility to Mental Group. There's a mention in 5th that refers to this Invisibility also working against Telepathy in some circumstances, but the reference is not very clear to me. In what circumstances is a character invisible to Telepathy or other mental powers (besides Mental Awareness or Mind Scan) with Mental Group Invisibility?

Sorry I can't provide page numbers, but my book has been lent out.

[Steve Long]

See the Rules FAQ under "Invisibility." If that doesn't answer your question, please post a follow-up.