Tempel is one of the most difficult bosses in the game which many newer players struggle with. This is due to his extremely high attack speeds, and the way his attacks are chained, leaving players limited time to react and dodge. Therefore, the Chalice (Greater Artifact) is recommended for first-timers to give them time to learn the different attacks and their timings.
Tempel has 2 phases - the First Phase is held in the Castle, while the Second Phase is held on the asteroid belt. The Second Phase is only unlocked after clearing Challenge Mode once.
In Phase 2, players should prioritise dodging his attacks and wait for him to float and perform his Meteor Rotation attack.
Phase 1
Phase 2