Signs, Seals and Incantations by MoonriseCZ

Signum: Pulse

1-level Evocation

Every creature in a 5 ft cone makes a strength check against your spell DC. If the creature succeeds on the throw, it avoids the effect. If it loses the check any melee attack against it has advantage until the beginning of your next turn. If the creature loses the check by more than 7, it is knocked prone and any melee attack against it has advantage until the beginning of your next turn.
At higher levels: For every level beyond the first the range increases by 5 ft.