After the battle in the Fear God's Realm, Demon Lord Soran finally underwent his most important evolution.
Demons had two forms of evolution. One fundamentally changed their species, such as evolving from a Barlgura into a Glabrezu. The other involved advancing further within their original form. There were two ways to achieve this advancement: taking levels in another class or changing their base form.
For the Balor line, including Balors of flame, this advancement brought enormous improvements.
Class advancements for Balors mainly included Headhunter, Executioner, and similar classes, while advancement in form meant evolving from a [Large Outsider] into a [Huge Outsider].
The latter brought an even greater improvement.
That was because, after advancing into a [Huge Outsider], a Balor effectively gained the [Boss] template.
A Huge Outsider Balor had twice the base hit points of an ordinary Balor. Once its evolution was complete, its vitality could utterly dwarf a dragon's.
Take red dragons, the strongest of the chromatic dragons, as an example. A hatchling's base hit point bonus was 8, a wyrmling's was 12, a juvenile's was 15, a young dragon's was 20, an adult dragon's was 24, a mature adult dragon's was 27, and an old dragon's was 30.
In other words, the Balor form's base hit point bonus of 30 was equivalent to that of an old red dragon.
A venerable red dragon had a base hit point bonus of 33, an ancient dragon had 36, an elder dragon had 39, and a primordial dragon had 41 or more.
Even a great wyrm red dragon only had 41 or more.
Depending on the strength of its bloodline, a great wyrm red dragon had at least 41. Its upper limit was unknown, but there were likely quite a few with bonuses of fifty or sixty.
Now, after evolving