What was Ultima's test? What happens to Tenorio?

Ultima must pass through a door guarded by the sign of the Holy Cross.

Tenorio is blinded by Ultima's owl.

"It is true that no person of evil, no bruja, can walk through a door guarded by the sign of the Holy Cross.

But the owl sought only one man, and it found him. It hurled itself on Tenorio, and the sharp talons gouged out one eye from the face of the evil man.