You summon a mass of leeches and hurl them at a creature within range. Make a ranged spell attack against the target. On a hit, 1d4+2 leeches attach to the creature. Each leech has 2 hit points and an armor class of 16. At the start of each of the target’s turns, it takes 1d4 necrotic damage for each leech attached to it.   As an action on their turn, the target or a creature that can reach them can make a Strength ability check against your spell save DC. On a success, it removes a number of leeches up to its Dexterity ability modifier (minimum of 1).   If a creature takes 10 or more damage from the leeches in a single turn, its Constitution ability score is reduced by 1 until it completes a long rest. A leech disappears if it is reduced to 0 hit points, removed from the target, or the spell ends.