Spiritbinding = Ex?

[Pseudopsia]

Character bound gear . Some MMOs prompt you when you go to equip an item saying it will become bound to your character. What SE is saying is once you kill something while wearing that gear you will not be able to sell or trade that gear to another player. Crafting or harvesting while wearing gear will bound them to your character as well.

This is to take items out of the market so it's harder to flood the market and keeps prices from collapsing.