X1.5 Treasure Multiplier for repeating Level 500 delve

There should be some additional reward for repeating a delve that’s been beaten at level 500. As it stands now, you can repeat at L50 with a .5 multiplier, or repeat at L500 for the same reward as if you had left it at L20, but at a much slower pace and higher risk of failure. Giving a bonus multiplier for completed delves would reward progress and allow players to continue to benefit from the resources they used to raise hoard and kingdom levels in order to reach the end of the delve.