The Rune of Augmented Capacity increases the capacity of the Blood Altar by a multiplicative +7.5% per rune. The Augmented Capacity runes apply after the regular Capacity runes.
Rune of Aug. Capacity
With some Netherite Scrap and some Intricate Hellforged Parts looted from the Demon Realm, you can double the power of your Rune of Augmented Capacity, increasing the capacity of the Blood Altar by a multiplicative +15% per rune.
If you change your mind, you can undo the recipe in the ARC.