AdmundfortGeographer
Getting lost in fantasy maps
I posted this recently on WotC's boards, but got no takers... So... Here it is reposted. Any help will be greatly appreciated. 
I was looking at a monster in the Monster Manual 2 with the Telepathy ability. Is it stated anywhere that a creature with Telepathy must have line-of-sight to communicate with another creature telepathically?
The meenlock can only communicate via telepathy in fact, and lives in a warren of tunnels small enough for Tiny creatures, so I would imagine that a creature doesn't need line-of-sight with the other creature in order to use its Telepathy to sommunicate. So a creature with Telepathy could conceivably communicate straight through solid stone up to the range of the ability.
Does a creature with Telepathy automatically sense minds that enter the ability's range? If not, how would it know it could communicate with the other mind? Thus my question about needing line-of-sight (via vision, or tremorsense, or blindsight, etc.)
If a creature with Telepathy does know when minds it can communicate with are in its range, does Telepathy include some ability to locate with enough precision to discern single minds out of crowds of minds? It seems silly to ask that, with the apparent answer being of course it could. But then another question arises, is Telepathy enough to target such a creature for attacks? Such as the target of a feeblemind spell?
Does the Telepathy ability include some feature of the detect thought spell built in?
What all these questions are leading up to issues with the meenlock's Rend Mind ability. It is worded thusly, "Rend Mind (Su): A meenlock can project thoughts and suggestions into the mind of a single creature within 300 feet. These thoughts are usually geared to cause paranoia--images of stalking monsters or peering eyes, and the sensation of being followed, watched, or sized up. The target of this mind-affecting phantasm must make a successful Will save (DC 14) or rake 1d4 points of Wisdom damage. Once a meenlock uses this ability, it must wait 1d4 rounds before doing so again." FWIW, meenlock's telepathy range is 300 feet as well.
So, can a meenlock hit a target with Rend Mind though 299 feet of solid stone?
Thanks for any helpful comments to clarify.
Regards,
Eric Anondson

I was looking at a monster in the Monster Manual 2 with the Telepathy ability. Is it stated anywhere that a creature with Telepathy must have line-of-sight to communicate with another creature telepathically?
The meenlock can only communicate via telepathy in fact, and lives in a warren of tunnels small enough for Tiny creatures, so I would imagine that a creature doesn't need line-of-sight with the other creature in order to use its Telepathy to sommunicate. So a creature with Telepathy could conceivably communicate straight through solid stone up to the range of the ability.
Does a creature with Telepathy automatically sense minds that enter the ability's range? If not, how would it know it could communicate with the other mind? Thus my question about needing line-of-sight (via vision, or tremorsense, or blindsight, etc.)
If a creature with Telepathy does know when minds it can communicate with are in its range, does Telepathy include some ability to locate with enough precision to discern single minds out of crowds of minds? It seems silly to ask that, with the apparent answer being of course it could. But then another question arises, is Telepathy enough to target such a creature for attacks? Such as the target of a feeblemind spell?
Does the Telepathy ability include some feature of the detect thought spell built in?
What all these questions are leading up to issues with the meenlock's Rend Mind ability. It is worded thusly, "Rend Mind (Su): A meenlock can project thoughts and suggestions into the mind of a single creature within 300 feet. These thoughts are usually geared to cause paranoia--images of stalking monsters or peering eyes, and the sensation of being followed, watched, or sized up. The target of this mind-affecting phantasm must make a successful Will save (DC 14) or rake 1d4 points of Wisdom damage. Once a meenlock uses this ability, it must wait 1d4 rounds before doing so again." FWIW, meenlock's telepathy range is 300 feet as well.
So, can a meenlock hit a target with Rend Mind though 299 feet of solid stone?
Thanks for any helpful comments to clarify.
Regards,
Eric Anondson