Azevult's Tentacle Dome

Eldritch tentacles erupt from the ground in a 30 ft. diameter ring around you and form into a dome. The dome does not move with you, and will remain stationary after the dome is completed. If the dome cuts through a creature, they are pushed to one side of the wall (your choice which side). Nothing can physically pass through the dome. It has an AC of 20 and has 100 hit points. It is resistant to all damage except for psychic. Any attempt to divine or predict what is happening inside the dome from outside or vice versa will fail. On your turn, you may use a bonus action to grapple any creature within 10 ft. of the walls, using your spellcasting modifier instead of strength.