I've got a lvl 3 Warlock who's made a pact with a Great Old One. The combo in question goes like this:
Awakened Mind (30 ft telepathy at lvl 1)
Pact of the Chain w/ Imp (Imps have devil sight)
Voice of the Chain Master (Warlock can perceive through familiar's senses)
Darkness (lvl 2 spell, 15ft radius of magical darkness)
Does this combo allow the warlock to become ridiculously overpowered by being able to see using the Imp's devil sight and inform the party of enemy positions telepathically?
Does the rest of the party, unable to actively see the enemies, still have the same disadvantage as they usually do in Darkness (disadvantage on attacks, advantage on defense), despite having up-to-the-moment position details being conveyed telepathically?
Is there some middle ground others have tried out in this situation? Beyond the two approaches mentioned above, I've been thinking something along the lines of "teammates have no disadvantage, but warlock would have to use their action to relay all the information or else they will get disadvantage again."
It sounds like it could be an amazing combo, but the line between "amazing" and "broken" can be pretty blurry sometimes.