Runecraft

Buy essence, craft it into runes at an altar and sell the runes. Every rune has levels where one essence starts making an extra rune, so the same altar pays more as you level. Enter your level and how much essence you carry per trip (28 in an inventory, more with essence pouches). Soul runes and combination runes are not here: they need more than bought essence. Prices assume you buy and sell instantly, so these profits are the safe floor; with offers you earn more.