mellored
Legend
I'll stay with familars. If I send the Defender into a room and it dies, I'm out of luck. I have to go into the room to get it back.That’s an important question, since you might use it on another player character or other ally. Making it quite common. Logically, the effect should end if the recipient is dead our unconscious - but the text doesn’t actually say that. I - do not know.
Also, Familars can fly, be invisible, burrow, blind sight, and other features as needed..
Probably going to skip Wizard. Too much investment and there's a good chance it dies anyways.
That requires a bonus action to move, which conflicts with Gaze of Two Minds. Same issue with Arcane Eye.The archivist subclass has a pet that is invulnerable and can be used to cast spells from its space though.
Unseen Servant could work in a pinch. It's a bonus action to command, but tell it to wait a moment and then go stand in the next room.
Also, Gaze is till the end of your turn, so still opportunity to use a bonus action. The recall your Familar with an action.
Also, Cloud of Daggers works with this strategy, Moonbeam isn't needed.
So....
Wood Elf, Archfey Warlock 11 / Druid 2
Invocations: Pact of the Chain, Agonizing Blast, Repelling Blast, Eldritch Spear, Gaze of 2 Mind, One With Shadows, Visions of Distant Realm.
Feats: Elven Accuracy (they can't see you, so easy advantage). Inspiring Leader. Spell Sniper.
Probably as far away as possible, with good escape options.