These tokens are used in the Agents of Oryx events.
When a full stack is built, the stack can be transformed into an Agents of Oryx equipment item.
The different token types correspond to:
Shard of the Mad God (stacks to 25) - Agents of Oryx Weapons
Shard of the Intern (stacks to 15) - Agents of Oryx Ability Items
Shard of the Doorwarden (stacks to 35) - Agents of Oryx Armors
Shard of the Advisor (stacks up to 35) - Agents of Oryx Rings
The Shard of the Mad God was introduced in Patch X.32.0.4 (Oct 2019).
The Shard of the Doorwarden was introduced in Patch X.32.4.1 (Jan 2020).
The Shard of the Intern was introduced in Patch X.34.1.0 (Jun 2020).
The Shard of the Advisor was introduced in Exalt Version 220.127.116.11 (Nov 2020).