UPDATE 5

New update live (just reload the app) 
Power → Score We cleaned up the gear numbers — Power is gone, everything is Score now.
Score = how deep your gear counts (drop depth + how strong the piece is for that depth)
Your kit Score is the average of equipped items
Higher Score is better for depths — keep it close to your target Depth so enemies don’t get tankier
Quality is still just roll luck (Broken → God Roll)
Inventory, reveals, compares, profile, and the glossary all use Score. Attack Power / Spell Power are unchanged (those are combat stats).
Should feel way less confusing — one number to care about. 
Arena
Elite Ranks (Grandmaster & Challenger are now live)
Explanation to ladder added to arena info