The hall of Scarlet King

Ground starts to boil with dark red liquid, while air begin to fill with little bloody drops, before transforming into a cube that is 90 ft. in all sides. Owner of the spell gets a tall blood crown to show that he is the king of this place. Cube cannot be destroyed nor dispelled.

While in that cube, owner gets bonuses: all damage attacks get a bonus of Profiency Bonus. 

Friendly creatures: get 2 hit points for each level of spell that been used by owner.

Enemies: speed decreases in half because of sticky blood as floor, all flying creatures restrained by dark blood chains. Creature can try to destroy these chains by Strenght save roll equvalent to spell save of the owner.

Spell cannot be used till the next day.