What is this reward?

This was the top reward for the sand devil turn attack, I collected it but have no clue where it went to?

I thought it was the jewels for the soul summon event but apparently not.

Any help would be appreciated!

This was the top reward for the sand devil turn attack, I collected it but have no clue where it went to?

I thought it was the jewels for the soul summon event but apparently not.

Any help would be appreciated!