Pyros

Pyros is one of the four Elemental Titans of Pagan. He is the Titan of Fire, and also the most dangerous one. He also rules over the Daemons of Pagan. The school of magic connected to him is Sorcery, the magic of fire. Like his brother and sister Titans, Pyros is a servant of the Guardian. The Avatar puts an end to him in Ultima VIII.

Pyros and the other Titans became powerful when the Guardian tricked the Pagans to make them powerful through various means. In the war against the Zealans, he rained fire from the sky, and covered vast areas in lava, before assisting the Guardian into destroying most of the world.

After the Guardian moved on however, he came into conflict with the other Titans, but primarily Hydros, Titan of Water. Pyros demanded high prices for not devastating the land, but still occasionally allowed the volcano's eruption (one such eruption led to the creation of the Daemon's Crag). It ended when five Theurgists -- who later would became the Sorcerers -- trapped him with the help of the Tongue of Flames, forcing him to lend them a part of his powers.

In his rage, Pyros only wanted revenge over such an act against him. He had time and could wait. Centuries would pass until he finally saw his chance. When the Avatar placed the Tongue of Flames on the great pentagram in Ultima VIII, he was free once again! Pyros laughed in dark happiness, while letting the volcano erupt. But his happiness was only short lived; The Avatar confronted him in the Ethereal Void, using the Tongue of Flames to drain him of all power, destroying him once and for all.

Video
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How to really screw up the summoning of Pyros, and the results.

Trivia

 * Pyros appearing in Ultima IX can only be seen as one, big error.
 * It is possible to sabotage the summoning ritual, resulting in Pagan being doomed and the Avatar being killed, ending with the Guardian giving an evil chuckle.
 * Pyros is also called the "Daemon King" (no wonder, considering his looks).
 * The dynamics of the Titans is explained by Vardion. Pyros likes his brother Lithos. He hates his sister Hydros. And his sister Stratos, he has no quarrel with.
 * Pyros also resembles Guardian slightly.