Durability + Mightstone

But Urza dropped his stone. Only for an instant, and he still gripped it in his hand. But he dropped his stone, and it was enough.

A violent rainbow of energy spewed forth from Mishra's stone, and slammed into Urza. The lanky Chief Artificer was bodily lifted up by the force of the blow and flung backward, against the armoire, breaking the doors of that cabinet inward from the impact.

Then suddenly the energy from Mishra's stone went out, and it was as if those within the room were suddenly plunged into the dark, so great was the magnitude of difference in the light. Tawnos blinked and started toward where he knew Urza lay. Someone heavy and burly,

Mishra, he realized later, slammed into him, brushing past him and out the door.

Kayla was at Urza's side already, crying as she knelt next to his prostrate form. Urza's eyes were open, but showed only the whites, and his breath was shallow and frothy. Still clenched in his hand was his Mightstone, a rainbow of colors leaking between his fingers.

"The temple amulets," said Tawnos to Kayla. "The ones Urza made. Do you have one here? Perhaps we can ..."

Kayla was nodding but neither had time to finish their thoughts. The stone clenched in Urza's hand began to pulse more, to flash through the spectrum, and into ranges that Tawnos felt more than saw. Slowly, Urza's other hand raised, and grasped the stone, and his breathing became more regular. His eyes closed, and when they opened again, they were normal.

***

The Brother's War, Chapter 14