Grandiose's primary ability is one that allows him to create a blue-green forcefield around himself. His forcefield increases in brightness over time, and ultimately is capable of detonating and causing a large explosion.
Grandiose fought against the Simurgh in Madison, helping in the attempt to drive her away from the city.
The Simurgh took him out of commission with her telekinesis, impaling him on some rebar near a group of teenagers.Dragon informed Grandiose that he had spent too much time in range of the Simurgh, and that he would have to die there due to the Simurgh's influence. Urging the teenagers to leave, Grandiose held his armband to his chest and died as it exploded.
↑ 1.01.1The cape, in a bodysuit of velvet blue with gold armor, had been impaled on a tangled mess of rebar, his intestines pushed out the front of his stomach. - Excerpt from Migration 17.2
↑The bubble-man flew forward, aiming not for the Simurgh, but the machinery she’d gathered to one side. His forcefield swelled, a blue-green that glowed brighter and whiter with every passing second. Just as he reached the machinery, it reached a critical level and detonated. The Simurgh was already putting one wing between him and the machinery. She took more damage than the machine did, and even that was minimal. Scorched, scattered feathers. - Excerpt from Migration 17.2
↑Krouse grabbed Marissa and turned to run, barely managing to keep his feet under him with the uneven ground and Noelle’s weight. He glanced over his shoulder to see the cape pressing the armband against his collarbone.
They weren’t four paces away when the armband detonated, a small, localized blast that didn’t even consume him in entirety. It did take his head, most of his upper body and his left arm. The remainder of him was scattered around the surrounding area. - Excerpt from Migration 17.2