Underkeep Blood Mage Guide: Bones and Health Costs

Check the Blood Mage’s casting cost before committing to a spell. The class uses a different resource pattern from a conventional mana caster, and misreading that pattern can put the hero at risk.

Separate the displayed resources

The developer described casting with bones during development. The current player guide reports that ordinary blood spells use a bone when one is available and otherwise spend health. It also identifies exceptions, including a healing action with its own cost rule.

That is a player-documented mechanic, not a cost simulation verified by this site. Read the installed spell tooltip and watch the resource change when using an action. Do not assume every Blood Mage skill follows the same exception-free rule.

Before a dangerous cast

1. Check the hero’s current health and the party’s available bones.
2. Read the selected spell’s cost and any exception stated in its description.
3. Consider what health will remain if the spell uses health instead of a bone.
4. Check whether another hero can safely finish the target or provide recovery.
5. After the action, confirm the resource that was actually spent before planning the next cast.

The purpose is to avoid an accidental resource crisis, not to promise a particular damage breakpoint.

Build around the actual equipment

Do not assign every upgrade solely from a class label. The player guide notes that useful Blood Mage equipment can have Wisdom requirements even though its main class stat is Endurance. Inspect the item before planning a future loadout.

Enemy and status interactions

Blood-themed attacks and existing Bleed effects can interact, but an enemy’s immunity or resistance matters. This page does not supply a verified full enemy chart, exact bone drop rates or a complete best build. Carry a fallback action and read status results during the fight.