Shroomite armor - Official Terraria Wiki

Step 1

↑ When a non-boss enemy is targeting a player with negative aggro who is not currently using an item, the game will prevent them from turning to face the player. Therefore, it only works on enemies who must face left or right towards the player to chase them. A general rule of thumb is that it will not work on enemies which rotate 360 degrees to chase the player. For example, it will work on a Wall Creeper while it is grounded, but not while it is crawling on a wall. It will also not work on attacks outside of normal movement, such as the Giant Tortoise's leap.

Step 2

↑ 1.0 1.1 1.2 This is not a typo. The increase is applied multiplicatively, after all other damage increases have been applied. ↑ Information taken from the Desktop 1.4.4.9 source code, methods Update() in Terraria.Player.cs and GetWeaponKnockback() in Terraria.Player.cs. ↑ Information taken from the Desktop 1.4.4.9 source code, method GetWeaponDamage() in Terraria.Player.cs. ↑ 4.0 4.1 Information taken from the Desktop 1.4.4.9 source code, method Update() in Terraria.Player.cs.