unharmed by Rakdos' flames

And then, of course, Jace spotted Gideon, riding atop the demon’s head. Rising up within the very flames of Rakdos’ crown, Gideon’s white aura of invulnerability must have been protecting him from the hellfire, but from where Jace stood, Gideon Jura seemed only to be at the white-hot center of the hellish blaze.

***

War of the Spark: Ravnica, Chapter 57