It's basically a charge, as others have said (movement + attack), but only if the character takes no damage from the fall (damage = falling prone).How would you handle an enemy jumping from a raised ledge to attack? Say an enemy jumping at you from the tree tops or jumping off a ledge at you? Would it be handled as a charge, with an athletics/acrobatics check?

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.