Stepping Stones are collected by completing Tasks inside the Brawl, as well as for each opponent Dragon that is KO'ed during Brawl battles.
These Stepping Stones are spent to progress in the Bottomless Dungeon and open Dungeon Chests, but are reset at the end of the weekly event and converted to bonus Dungeon Tokens at the start of the next event.

Dungeon Tokens are only found within the Bottomless Dungeon's Chests and are used to purchase items in the Dungeon Shop as well as to remove obstacles from the Tycoon Island and purchase new areas to build on.