Achilles' Elemental Arrow

When you nock one of these arrows into your bow, you feel the fletching vibrate in your hand. You whisper to it, "Hinder my enemies, so that I may smite them," and the vibration stops and is replaced by a soft green glow. The arrow becomes naturally drawn to the ankle of your target, granting you and additional +1 on the attack and damage roll. For large creatures you attack with disadvantage. The target must make a Dexterity saving throw of 15 or become hindered by the arrow and become prone. The target now has disadvantage on all throws until it is no longer prone.

Upon a successful hit the target will take an additional 1d6 magical/elemental damage depending on the focus item used to attune. For example (Holy Symbol/Water = Radiant Damage; Poison fang from a snake or monster (or similar) = Acid damage; an undead eyeball or limb = necrotic damage; etc.) 

If the enemy is prevented from standing-up at the beginning of its next turn, for any reason, it takes additional 1d6 magic damage.

At Higher Levels: When attuned at higher levels (5, 9, 12, 15) the elemental damage is increased by 1d6. 

Notes: Damage: Radiant, Bonus: Magic, Prone, Achilles' Arrow Requires attunement by any magical wielding class. The character must meditate with the arrows using a focus item in their hand. The focus item acts as an elemental enchantment that grants an additional 1d6 magical/elemental damage based upon the item used. , Damage, Buff, Combat, enchantment