Quest:Ultimate Altar Of Earth
From Cities
Prerequisite: Have a balance of at least 100,000 GP
Reward: +50 MaxHP, HP regeneration
Location: The Taxing Cellar, 64E 44N DSSGCM, Altar at 46E 44N DSSGCM
AP Cost: 100 to worship plus costs to navigate Taxing Cellar
Other Cost: Lots of stuff
Travel through the Taxing Cellar to reach the Ultimate Altar of Earth. Once you worship there, you get +50 MaxHP and intrinsic regeneration--while under your max HP, you gain 1HP automatically every 4AP you spend (this does stack with the healing spells). The reward message also encourages you to earn glories through "aggregation".
Note that unlike the Vents, free access to the cellar is not granted once the altar is worshiped at.
