Brain Trust

9th-level divination
Casting time: 1 action
Range: 30 feet
Target: up to eight willing creatures of your choice within range
Components: V, S, M (a stack of legal paperwork at least half a foot tall)
Duration: 24 hours
Classes: Wizard
Subclasses:

You forge a telepathic link among up to eight willing creatures of your choice within range, psychically linking each creature to all the others for the duration. Creatures with Intelligence scores of 4 or less aren’t affected by this spell. Until the spell ends, each of the targets gains the following benefits:

• It can speak, read, and write each language that another creature in the link knows.

• It can communicate telepathically through the bond to any number of other creatures in the link. This communication is possible over any distance.

• It has proficiency with each skill, tool, weapon, and armor with which another creature in the link has proficiency. If the creature sharing its proficiency with the link has expertise with the skill or tool, so does every other creature in the link.

• Its Intelligence score becomes the same as that of the creature with the highest Intelligence score in the link. The same is true for its Wisdom and Charisma scores, corresponding to the creature with the highest related ability score in the link.

• It knows each cantrip that another creature in the link knows. It uses the same spellcasting ability for the cantrip as the creature sharing its cantrip with the link.

The link ends if you or one of the targets casts this spell again. A target is also removed from the link if it dies or if it is ever on a different plane of existence from you.