Complete the required quest chain that unlocks the Theta Container
Check the current patch notes for the exact unlock method, as it can change by wipe
Verify whether Theta Container is available from traders, quests, or event rewards in the current version
Reach the required player level if the container is level-gated
Finish any prerequisite quests tied to the container unlock
Claim the container from the appropriate trader or quest reward screen once unlocked
If it is a seasonal or event item, obtain it only during the active event period