Solo Design is a series of articles exploring solos -- monsters designed to engage an entire party -- using monsters I've designed for my own games.
In one session I wanted my players to fight two back-to-back solo battles with no time to rest, against two almost-legendary knights in my campaign world. More than that, I wanted the two fights to feel very different, and for the stat blocks to match the personalities of the two generals.
The first of the pair is Sir Arthur the Grey Knight, a military general and powerful storm sorcerer who wields lightning and thunder against his enemies, and can turn those elements back on his attackers. Unlike many artillery monsters, he has a couple of tricks up his sleeves to remain mobile and avoid being pinned down by a defender.