[RPG] Can Silent Speech be used with invisible targets and ones behind full cover

dnd-5ehalflingracial-traitstargetingtelepathy

I'm thinking of creating a party of twin Ghostwise Halfling Rogue. They can infiltrate a castle and communicate with each other silently.

If one of them went invisible, can the other use Silent Speech to speak to him? What if the invisible halfling position is already known, such as standing beside the speaker? Can it be used if they are separated by walls, and they already pinpointed each other position by knocking on the walls?

Best Answer

Silent Speech doesn't require vision of the target.

Silent Speech, unlike other forms of telepathy in 5e, doesn't require you to see the creature you wish to communicate with.

Silent Speech. You can speak telepathically to any creature within 30 feet of you. The creature understands you only if the two of you share a language. [...] (SCAG, 110)

Compare this, for example, to other types of telepathy in 5e, such as the warlock's Awakened Mind.

Starting at 1st level, your alien knowledge gives you the ability to touch the minds of other creatures. You can communicate telepathically with any creature you can see within 30 feet of you. [...] (PHB, 110)

If something requires vision or line of sight, it states so. Silent Speech doesn't, so you should be able to speak to a creature that you know is there, even if invisible or separated by a wall, using Silent Speech.

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