What the early screen tells you
Backpack: check what you already rolled before spending again.
Roll: the central action for blades or pets in the official gameplay loop.
Upgrade: opens a connected tree containing observed nodes such as Luck, Pet Rolls, Damage, Loot, Max Fruit, and Auto Roll.
Shop, Rebirth, and Index: visible secondary systems. Open them to read current requirements, but do not assume a reset is profitable before the game explains the tradeoff.