While Boledo was busy clutching at their oversized eye in pain, Ustrata was already on the move to keep the momentum.
The crystalline alien slammed their hands onto the ground palms down and began to chant. A blue shine started to appear on the ground where his hands were contacting the floor, slowly, and then much quicker as it crept toward the stunned Boledo. His spell was creating a crystal growth, and its target was the opposing alien.
The growth grabbed onto one of Boledo's three legs and latched on hard before beginning to clamber up the alien's leg. At first it seemed as if the spell was converting Boledo's flesh into more crystal, but considering the rulings on lethality, I had to instead assume that it was some kind of encasement. Ustrata was trying to imprison the three-legged alien in a coating of crystal.