Also called Fuel / stamina. Regenerates 1 point every 6 minutes up to 240 — about 24 hours from empty to full. Saved locally in this browser.
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Early accounts favor Golden Calyx (credits) and Crimson Calyx (EXP / Trace mats). Mid-game shifts toward Cavern of Corrosion for relic sets and Stagnant Shadow for ascension. Always spend down before long breaks — overcapping wastes hours of regen.
Related: farming guide, pity calculator, codes.