experience-to-gold

Experience to gold is a set of mechanics allowed converting expirience(limited from start of current level) to in-game currency(e.g.gold coins).
Types:
A.Spell: spells costs experience to create gold(or random items equal of value).
B.Vendor: Items/Gold priced in terms of experience points as alternative currency.
C.UI: Convert experience to gold with a button or buy experience with gold.