Dimensional Rift

You create a black hole that absorbs any hostile creature within 500 feet. You and the creatures get pulled into an alternate dimension where the spell caster controls what happens. The dimensions can look whatever the caster wants it to look like. You have a +5 Dexterity boost when inside, and have a bonus on all saving throws while inside. All creatures except for you have the disadvantage on all saving throws involving sight. You also get granted a special blade that envelops the properties of the spell while in the domain. It can teleport you, it can make you invisible, and, while inside, you also get +100 speed. Every 2 rounds, all the creatures in the domain take 2d4 thunder damage.