Hello
@zalan003
We're sorry to hear that you've lost one of your items on Skyblock. It's possible that you or one of your friends mined the spawner, and received it in their armour slots if their inventory was full, or maybe someone else lost it :(
The only solutions for this problem would be to either buy a new spawner in the shop or by resetting your island if you just started a new one.
Hope this helps.