Purchasing a Tier 4 Starter Slot grants you permission to breed an existing starter stryx within the Tier 4 category one time. You must have permission to breed a second stryx to the starter you select in order to use this slot.

Check the Stryx Starter Slot Tiers guide to see which stryx are included in Tier 4. You may also choose from the Tier 3 Starter category or below instead.