What does it mean to say that the Turtle Armor "increases chances of being targeted by enemies"?

The tooltip for Turtle Armor says that it "[i]ncreases chances of being targeted by enemies". Can someone explain what this means? It seems to me that every enemy that spawns targets me anyway. Does it increase spawn rate, like a water candle? If you're playing single player, what (if anything) does it do?


The effect makes you more likely to be targeted by enemies instead of other players in multiplayer.