I believe it’s the same as any Streak. For example: The Gold Streak for the Avarice/Avaritia Conquests. Or the streak for Breakable Objects to get +%Movement Speed.
The Altar’s Gateway Seal:
- Doubles the duration of the streak. (Time between last kill and next kill before expiring).
- Doubles the reward of the streak. (After one streak expires and the next one begins).