Effects of Memer's Riposte are: Edit
1) Increases damage of all types by 15%.
2) Mirrors 500% of taken damage back to all enemies on screen. No matter, contact or projectile.
3) Reduces your critical strike chance by half, but your crits can now deal 4x damage instead of 2x.
This item requires some very specific ingredients.
1) National Ugandan Treasure Edit
It can be gathered from Moon Lord itself by 50% chance, but only if you are equipped into Pink Guy's full set (as main armor). Also works as boss summoning item.
2) Pink Guy's Set Edit
It can be gathered from any Treasure Bag after beating Plantera with 1:1000 chance.
3) Ban Hammer Edit
It can be gathered from any Treasure Bag after beating Plantera with 1:1500 chance.