The Tavern

Playing GrEE of Makhleb, found shop, and bought book of Blood, there was 3 spells:
sublimaton of blood (gray - why?)
wereblood (blue)
summon hydra (blue)
I hit shift+M, and there is no sublimation of blood to memorise! Why is that? Gargs don't have blood?

Yes, it seems that as gargoyles are unliving creatures, they can't cast sublimation of blood.