Each level separately adds 2.5 (Heart.svg × 1 1⁄4) extra damage to each hit, to "arthropods" only. The enchantment will also cause "arthropods" to have the Slowness IV effect when hit. The duration of the effect is a random value between 1 and 1.5 seconds at level I, increasing the max duration by 0.5 seconds each level, up to 3.5s with Bane of Arthropods V.