Dungeons & Dragons: Tasha’s Cauldron of Everything (D&D Rules Expansion book): 1 (Dungeons & Dragons )

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These are not rules in the traditional sense. These are suggestions a DM might use to facilitate a subclass change in their game. Under " Training Time", we see (emphasis mine):

The swarmkeeper has a magical connection with some type of natural swarm. This could be bugs, birds, or even pixies. Using the swarm you gain Mage Hand, and the swarm can also boost your damage rolls, move enemies, or even transport you by 5 feet.The central aspect of this class is the third level ability Wild Surge, which causes wild magic effects to occur when you rage. At higher levels you can use your connection to wild magic to help allies recoup spell slots and eventually control your wild magic effects. Despite the name, this doesn’t allow you any spellcasting abilities. Bard – College of Creation This combat-centric domain centers on the dual premises of the restorative nature of sleep and the need to destroy the dark things that lurk in nightmares. These clerics gain proficiencies with martial weapons and heavy armor, and they can share their newfound darkvision with allies. Your channel divinity is an interesting buff that allows creatures close to you to gain temporary HP or end the charmed or frightened effect. The radius of this effect grows at higher levels. Druid – Circle of Stars Creature type. You are a humanoid. You determine your appearance and whether you resemble any of your kin.

The fey theme continues at Level 7, where you gain advantage against being charmed or frightened. Eventually you learn to cast misty step almost at will and you can summon fey to do your bidding. Ranger – SwarmkeeperIn addition to these brand new subclass options, the book also reprints some other archetypes. These options include subclasses originally found in Mythic Odysseys of Theros, Guildmasters’ Guide to Ravnica, and Sword Coast Adventurer’s Guide. You can read our review of each of them below! The DM and players can work together to decide exactly how this works. A player may indicate their desire to change their subclass, and the DM can then work this out with the player, explaining how they can spend their downtime re-training and practising so that when they reach level X, they complete their training and acquire the features of their new subclass. Waiting for a level up is how I would first express this to the player. If they felt that was too long to wait, I would of course see how we could work a transition even sooner. What about rogues?