A divine self-destruction would forever be the final technique used by any God in order to transform their own eternal life and endless divine power into an explosion of despair that would drag their enemy to death with them.
A Low God could even kill a more powerful God with this. The importance of self-destructions keeping divine society relatively stable couldn't be understated.
However, was the current situation really that bad for Sophocles that he would need to go to such an extent?
Things obviously weren't that bad for him at all. The Chaos Abyss army was still endlessly arriving through the Dimensional Door. The Chaos Main Gods weren't at an overwhelming disadvantage yet. Nothing would have ended quickly at that point… and even if the Chaos Faction lost here, wouldn't it have been fine for Sophocles to run away? Would he really be stupid enough to die for the sake of the Chaos Faction?