Go to Bessie Burger in the shopping mall to unlock and upgrade Zombie Skills. Bessie manages this part of Davy's development. These purchases improve your available options for later dives; they do not preserve the exact build you selected during the last run.
For OT Gear development, the relevant shop is Ink on the Brain. For Zombie Skills, look for Bessie's burger stand.
Use Bessie Burger between dives
- Return to the shopping mall after a dungeon attempt.
- Find Bessie at Bessie Burger.
- Open the available Zombie Skill options and read their effects.
- Check the cost and any displayed requirement before purchasing an unlock or upgrade.
- On the next dive, choose among the Level-Up Receipts offered as Davy levels.
More facilities and options open as the story progresses. If the full selection you expected is not available yet, inspect your current story objectives and the shop's own requirements rather than assuming the menu is broken.
Unlocks expand the choices you can receive
During a dive, Level-Up Receipts offer skill choices. Unlocking more Zombie Skills broadens that pool. It does not guarantee that a newly purchased skill is one of the next choices shown.
That distinction explains why you can pay for an unlock and still need another run, or another selection, before using it. Check that the skill is unlocked at Bessie Burger before diagnosing its absence from a particular Receipt as lost progress.
When comparing purchases, read the effect in relation to the problem you want to solve. An option that helps a specific encounter may have less value on a different route. There is no universal first-purchase order or verified best upgrade list here.
Keep the shop's role separate from run leveling
Davy still starts each new dive at level 1. Bessie's unlocks belong to the permanent preparation that makes the next attempt different, while the level and selected Receipt build are rebuilt inside the dungeon.
Use the costs displayed in your own menu. This guide does not assign an unverified recipe, material quantity or boss requirement to every Zombie Skill.