Flock of Familiars,. Totally OP

So far everyone I've seen talk about this is missing one of the best parts of this spell. Find familiar requires you to use your action to see through the familiar, while flock says that the familiar can use their action to share their senses with you. Meaning that you can cast any spell that only requires you to see the target from behind full cover as long as you're within range by using your ba to have a familiar share its sight. I can send in my familiars and use Vortex Warp to bring out enemies one at a time from 90 ft away (180 with distant spell from feat), which is something that, rules as written, you could not do with find familiar. I don't agree that it's broken, I think it lends itself to a very particular style of play though, and that would be the "guy in the chair" archetype. 

If you do they run

They run so far away

Have been considering picking it up to use for exploration- not because it's optimal, but because each player (player, not character) can 'steer' a familiar.

Turn exploring into a bit of an out of character mini game, but a more collaborative one than it often ends up being.

FWIW - I think that RAW the new magic item Necklace of the Beastly Familiar could transform all of your Familiars summoned via Flock of Familiars into Beasts one magic action at a time. There is no limit on how many times you can transform a familiar and the transformation lasts 10 minutes. A Lvl 5 Spell (upcast FoF) + Legendary version of this magic item = herd of 6x T-Rex familiars.

EDIT: Ah just noticed there is a matching charm that your familiar must wear. So maybe this does not work. But would work to transform one... shame... I wanted 6x T-Rexs...

Necklace of the Beastly Familiar (Giant Scorpion)     AU p120
Wondrous Item, Rare (Requires Attunement By a Spellcaster)

This bejeweled necklace is set with chrysoprase and comes with a matching charm that can be worn by your familiar.

Familiar. While wearing this necklace, you can cast the Find Familiar spell from it. Once the necklace has been used to cast this spell, it can't be used to cast it again until the next dawn.

Beast Transformation. While your familiar is within 60 feet of you, you can take a Magic action to activate the necklace. Your familiar shape-shifts into a Giant Scorpion for 10 minutes.
While your familiar is transformed, its stat block is replaced by the stat block of the Beast form, but it retains its alignment, personality, creature type, Hit Points, and Hit Point Dice. Equipment the familiar is wearing or carrying doesn't change size or shape to match the Beast form, and any equipment that the Beast form can't wear or carry falls to the ground. Your familiar gains a number of Temporary Hit Points equal to the Hit Points of the Beast form. These Temporary Hit Points vanish if any remain when the transformation ends. The transformation ends early on your familiar if it has no Temporary Hit Points left.

Quote from StonyMac >>

FWIW - I think that RAW the new magic item Necklace of the Beastly Familiar could transform all of your Familiars summoned via Flock of Familiars into Beasts one magic action at a time. There is no limit on how many times you can transform a familiar and the transformation lasts 10 minutes. A Lvl 5 Spell (upcast FoF) + Legendary version of this magic item = herd of 6x T-Rex familiars.

It's worth checking with your DM as to whether they'd allow something like this, because the item is pretty clearly written with the intent that you're using it with a familiar from either Find Familiar or Battle Familiar, both of which limit you to having one familiar at a time. Flock of Familiars is a pretty obscure 5e non-core spell that was only ever published in one charity adventure; the designers of newer content are unlikely to be taking it into account as a possibility.

Agree - also that matching charm part kills it. Only noticed that after reading it several times... Still worth thinking about to convert one of them into something more...