When an item or attack does not work, check the requirement before replacing the hero. Race restrictions, weapon type and reach can explain different failures that look similar during a fight.
Equip with a purpose
- Read the item’s slot and requirements.
- Choose the hero whose role benefits from it.
- Confirm it is equipped rather than merely present in the shared inventory.
- Re-read the active skill’s required weapon or shield.
- Check whether the resulting attack reaches from the hero’s current row.
A weapon swap can make a previously usable skill unavailable. Select an action that matches the new equipment before assuming the skill points have been lost.
Check race restrictions
Stoneborn body armor is a specific reported limitation. That does not automatically exclude helmets, gloves and other slots. Use the current item and character descriptions to identify whether the problem is the slot, attribute requirement or another condition.
Keep a workable fallback
A higher damage number is not always an improvement if it removes the only attack your back-row hero can use. Inspect reach and spell resources before replacing equipment. Keep a known usable option while comparing a new loadout.
Ring-transfer crash
Patch 1.0.4 specifically fixes a crash when moving an equipped ring between characters. If you encountered that older problem, preserve the save and update through your store client before repeating the transfer. The note is not a guarantee that every inventory crash has the same cause.
What is not a confirmed item list
This page does not publish complete drop locations, shop inventories or a best-in-slot progression. It provides a diagnostic order grounded in the equipment and skill systems described by the sources.
Sources & version notes
Mechanics are reported in the original player guide; developer sources support the broader system. This is not an independent verification of every tooltip or balance value.
- VoidEngineer — original Underkeep Player’s Guide (updated 2026-11-08; checked 2026-11-09)
- Patch 1.0.4 Bugfixes (2026-11-07)
- Underkeep Steam store — app 2411200 (checked 2026-11-09)
Compiled from public sources. We have not personally played or tested these procedures. Check your installed build and its tooltips when details differ.