Chillsby's Transmutive Trident

You form an arcane trident in your hand and hurl it at an enemy. Make a ranged spell attack, dealing 2d8 force damage on a hit. If the creature is large or smaller it is moved 15ft away from you, otherwise, it is moved 5 ft. If the element is changed, the effect differs slightly.

Acid: The enemy takes 2d8 acid damage and their AC is lowered by 1 until the end of your next turn unless this spell is used again, at which time the AC is reduced for the next minute.

Cold: The enemy takes 2d8 cold damage and has disadvantage on Dex saves until the end of your next turn, unless this spell is used again, at which time the disadvantage lasts one minute.

Lightning: The enemy takes 2d8 lightning damage and loses their reaction until the end of your next turn if they are wearing metal this is made at advantage.

At Higher Levels. If this spell is cast at 3rd level, two effects can be combined, including damage. At 5th, three can be chosen. And At 7th, all four are applied.