My understanding is that any bleeding wound is supposed to work with BLB, so this strikes me as potential bug?:

>Your body feels at full strength.
>Your spirit feels full of life.
>You have open and bleeding sores all over the skin.

>Bleeding
> Area Rate

---

> skin slight
<... cast a couple of debil spells>

>tar blb
>Since you're not feeding enough power into the spell pattern to make it coherent, you quickly work your way to the minimum required.
>That won't affect your current attunement very much.
>Turning your focus solemnly inward, you allow the configuration of the Blood Burst spell to spread across your skin as a shadowy design of fractals and geometric abstractions.
>You begin to weave mana lines into a target pattern around a juvenile wyvern.
<...wait for targeting pattern; charge cambrinth>
>cast
>You swipe your fingertips across your hand.
>Your watersilk bag emits a loud snap as it discharges all its power to aid your spell.
>*With no bleeding wound*, your pattern drags vital energy out from within you to compensate.