i have an idea for maybe a very very very very very very very very very very rare relic. where every 10 digs it doesn't take durability, stamima or torch life and it digs sideways to the edge of the map, then it will triple all your healing during that time, triple all your profit. maybe it could be a way of prestiging too with the relics. once you collect them all you could put them in the sacrifice well and then you prestige with like double luck (if you add a luck system.)
this is just an idea and it could use some tweaking because i assume that this is would be painful to code in but it still would be a really cool relic and prestige method.