Domain Expansion
Conjure a domain and trap up to 3 creature within sight, into the domain. The caster can alter the look, size and effects of the inside of the domain until it is dispelled. The domain is a 20 by 20 foot black dome originating from the caster, if there is not enough space for the domain it can not be cast. The domain can be destroyed from the outside, it has 30hp. To cast the domain you must make an arcana check. No one can enter or exit the domain unless you dispel the domain or you get reduced to 0 hit points. Any creature that does not wish to be put in the domain must make an arcana saving throw higher than your initial arcana roll or they will be put into the domain. Any damage that is caused as a result of the domain or its effects is counted as 2d8 Psychic damage.
At higher levels:
For every spell slot level past spell slot level 3 you can trap 1 more creature in the domain.
For every spell slot level past spell slot level 3 you can add 1d8 Psychic damage for Domain attacks
For every spell slot level past spell slot level 3 The domain gains 5hp
At spell slot level 6 and above you can give allies advantage to all attack rolls
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