Dispel Magic (revised)

Choose one creature, object, or magical effect within range. For each level of spell active on the target, make an ability check using your spellcasting ability. If the target is an object the DC equals 10 + the spell's level. If the target is a creature make a spellcasting ability check contested by the target's spellcasting ability check. If the target  You gain a +2 bonus to your check for every level you are casting your spell above your opponent's spell level; or a -1 penalty to your check for every level you are casting your spell below your opponent's spell level. Either caster may add their profiency bonus to the roll if they are proficient with the (Arcana) Skill.

On a failure, the target spell succeeds and continues to take effect.                                                                                                                                                                                                                    On a success, the target spell fails and its effect ends. 
On a tie, the target caster's spell succeeds and continues to take effect.

Dispel magic has no effect on a vampire’s Charm ability or any other magical effect that isn’t a spell. It also does nothing to the properties of a magic item. It can, however, end a spell cast from a magic item or from another source. Dispel Magic does not negate or remove magical properties of an item but can end magic effects created by magic items if they are already activated. For example, if you cast dispel magic on a staff of power, the spell fails to disrupt the staff’s magical properties, but if the staff’s wielder casts hold monster from the staff, dispel magic can end that spell if cast on the target of hold monster.