Final Check on Current Errata

[OneShot]

@callen

That would require other errata to change Mutantum Magic, as Mutantum Magic does't add any guidelines, just adding Tethered, Boosted, and Harnessed.

We have (HoH:TL p.101):

The Mutantes design spells that have unusual variations on standard magic built into their effects, and only characters with the power to perform that kind of magic due to an appropriate Virtue can cast them.

So spell out this appropriate Virtue in The Tireless Flight as Mutantum Magic, and that there is no other version of this spell.

@callen

And now we would need an explanation how the spell can identify what Fatigue was spent for.

Here's one of many solutions to that:

Using The Tireless Flight requires a continuous specific Mutantum type of Concentration to keep Fatigue transformed to Light Wounds.
Normal Concentration anyway can break in combat or Certamen. The specific Concentration needed for The Tireless Flight certainly breaks in that case.

EDIT: 'Flight' in The Tireless Flight comes from fleeing, not flying.