Tasha's Ballad of Coven Making

You perform a ancient fey ceremony involving 3 faithful and willing humanoid creatures (including yourself). After the ceremony ends, the gemstones are infused with the participants hearts and a coven is formed between all of them.

The coven grants it´s members the following benefits, as long as the coven still exists:

• All coven members undertand each other, no matter what language they´re speaking.
• All coven members gain a telepathic link with each other as long as they are on the same plane of existence.
• All coven members gain resistance to two of the following damage types (choosen by the caster of the spell): fire, cold, lightning, poison, acid, thunder, necrotic, radiant and psychic.
• All coven members gain access to a Shared Spellcasting table but must share the spell slots among themselves. The table has a caster level equal to that of the caster of the spell, has 5 cantrips and a number of prepared spells equal to the caster of spell´s level plus their spellcasting modifier. The shared table can have spells from the spell lists of the caster of the spell and any other spellcasters that might have partaken in the ceremony. If a creature does not have a spellcasting ability, they use the same one as the caster of the spell.

The coven lasts forever, but can be disbanded if one of it´s members die. If a member of the coven has died, this spell can be cast again to recruit a new member, though only the new member requires to provide it´s own share of material components.