Enforced Strike

You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 5 feet of you. On a hit, the target suffers the weapon attack’s normal effects, and the used magic splashes from your weapon forming a 5 feet square below the target. The square lasts until the start of your next turn and any creature that ends its turn in it takes 1d6 damage. The nature of the damage is subject to the used magic:

If you use lightning to enforce the weapon's strike, a square of crackling energy is formed. If the target wears metal armor the damage increases to 1d10 lightning damage.

If you weave shadows in your weapon's strike, a square of dark shadows is formed with claws reaching out. If the square is in dim light or darkness the damage increases to 1d10 psychic damage.

This spell’s damage increases when you reach certain levels. At 5th level, the square deals 2d6 (or 2d10 if the condition is met) damage. At level 11th this increases to 3d6 (3d10) and at level 17th 4d6 (4d10).