The confirmed Blood Mage role

The Underkeep blood mage class has been described by the developer as a front-line option supported by a large health pool. That is the clearest confirmed answer for players wondering where the class fits in a party. Its name alone does not establish a health-spending spell system, a healing role, or an unlock quest.

In the developer's February reply about party roles, Thief and Bloodmage are offered as alternatives for the front line: evasion for the former, a large HP pool for the latter. Treat that as a description of the class's intended place in the group, rather than a published build sheet.

Why the demo may not offer Blood Mage

A later March developer response about the limited class roster still names Blood Mage among classes planned for the full game. A developer discussing a class's role does not mean it was selectable in every public demo build.

If it is missing from your character-creation screen, the supplied evidence does not establish a secret unlock. Check the current version and official announcements before following instructions that promise to enable it.

What to check when the class is available

Start with the current class description, its actual skill list, and the equipment requirements shown in your game. A larger health pool supports the front-line concept, but it does not tell you which abilities consume health, how healing scales, or which race is strongest.

For party planning, leave room for the roles your other characters must cover. The confirmed Blood Mage description does not justify dropping your healer on the assumption that the class automatically supplies equivalent recovery.

FAQ

Is Blood Mage meant to be a front-line class?

The developer specifically identifies its large HP pool as a reason it can fill a front-line role.

Does Blood Mage spend health to cast spells?

The cited material does not confirm that mechanic. Do not infer resource costs from the class name.

Is there a verified demo unlock method?

No method is established in the supplied sources. The developer distinguishes the limited demo roster from classes planned for the full game.