Base Class: Sorcerer
Between the countless worlds and crystal spheres, there exists the phlogiston. This rainbow colored substance suffuses the universe, acting as insulation against the gods and the planes, keeping each crystal sphere free of the influence of other settings. It is known for its explosive properties and the way it grounds teleportation and planar magic, even things as simple as a bag of holding. Every so often, a sailor that falls overboard will end up lost and adrift in the phlogiston. As their air bubbles lowly depletes, the sailor will find their body slowly petrifying, turning to stone rather than dying. There they float in the phlogiston, statues of the unfortunate soul that fell overboard. Hope is not completely lost for these unfortunate sailors. In the highly unlikely case that a ship comes across a drifting, petrified sailor, they can save the poor soul and bring them aboard. As soon as air returns to the sailor, the stone dissipates and the sailor regains their mobility. Although these people go on to live as they were, their long stay in the phlogiston has caused their body to become suffused with its unnatural energy. You or one of your ancestors was one such sailor, lost in the phlogiston and rescued. The phlogiston’s influence on your body and bloodline may have remained dormant for a time, but in you, the prismatic flames of the phlogiston are rekindled and manifest as sorcery.
Gift of the Void
At 1st level you can breathe and move normally in the void of space, even when no air or gravity is present.
Attuned Mind
Starting at 1st level, the influence of the phlogiston and its many currents and connections has granted you unique knowledge of wildjammers and their operation. You gain tool proficiency with water/sky vehicles. In addition, while attuned to a Wildjammer Helm, you can telepathically speak to any creature within your wildjammer's air envelope. You don't need to share a language with the creature for it to understand your telepathic utterances, but the creature must be able to understand at least one language
Mental Adaptability
Now your body has adapted to long term exposure to the powers of the phlogiston , Your mental fortitude is beginning to strengthen as well. Starting at 6th level, you gain resistance to psychic damage, and you have advantage on saving throws against being charmed or frightened.
Perfectly Attuned
Starting at 14th level, when you attune to a Spellammer Helm, you are no longer rendered helpless. So long as you remain within the air envelope of your spelljammer, you can continue to control the spellammer as if you were sitting on the Helm. During combat, you can act both as a Helmsman in wild jammer combat and using your character abilities against boarding parties in ground combat. In addition, you can Quick Attune to a Spelljammer Helm without expending a spell slot.
Phlogiston's Embrace
Starting at 18thlevel, you can unleash the unusual magic of the phlogiston around you. Each creature of your choice within 30 feet of you must make a Constitution saving throw against your spell save DC. On a failed save, the creature is petrified until the end of your next turn. On a successful save, the creature takes 3d8 fire damage. Once you use this action, you can’t use it again until you finish a long rest, unless you spend 8 sorcery points to use it again