Domain Expansion

Through a series of mystic incantations and hand movement, you may form reality into a bubble, creating a demiplane considered as your domain. Each creature within 30 feet must make a wisdom saving throw, being pulled into the domain on a failure. The domain occupies a 120-foot radius sphere, and may take the form of any location, no matter if you've been to it. Examples include a snowy forest with icy stalagmites, the inside of a volcano, or the top of a mountain where ancient glowing runes orbit the edge of the demiplane. Any creature besides yourself cannot teleport out of the domain.

While within the domain, you summon 1 major effect, and 3 minor effects, each of which take a turn. Any conditions or effects these effect cause only last until the end of the domain, before dissapating.

A major feature may be:

Summon Great Beast. You summon a CR 18 or below creature which instantly takes it's turn, obeying your commands. The creature dissipates at the end of the round.

Unblockable Incantation. You cast a 7th level spell without expending a spell slot. If this spell requires a saving throw, target creature automatically fails that saving throw. If this spell requires an attack roll, it automatically hits. 

A minor feature may be:

Summon Minor Beast. You summon a CR 8 or below creature which instantly takes it's turn, obeying your commands. The creature dissipates at the end of the round.

Immense Spell. You may cast a 4th or below level spell without expending a spell slot. This spell has advantage to hit, and the target creature has disadvantage on the saving throw.

No matter what, any effect or summoned creature from any of the spells cast only lasts until the domain closes.