Tower of Babel

Caster summons a magical circle beneath single enemy. Targeted enemy has to make a Inteligence saving throw corresponding to casters DC. 

If the target is trapped he is dealt 1d6 force damage at the beggining of his turn (or more on the upper levels).

Attacks against trapped target are made with Advantage.

Conditions for canceling the effect of the spell:

• Trapped target is hurt by any other source of damage except by the Tower of Babel.
• Target can make another Inteligence saving throw, whenever another living entity enters the range of 5 ft from him. If he succeeds, the spell is automatically canceled.
• Caster of this spell is hurt by any sort of damage.
• Target can make another Inteligence saving throw, whenever an attack is targeting him (or he would be affected by it) and the attack misses. If he succeeds, the spell is automatically canceled.