Wizard

Wizards are spell-casters that are focused on magic as a science. They are the spell casters, having most spells, most spell slots, and the only thing they cannot do is… They practically can’t heal.

In Gensokyo, Wizards are usually called Magicians, and most of them have willingly turned themselves into Youkai for the benefit of eternal life and lack of annoying human needs getting in the way of their magical endeavours. It doesn’t mean there aren’t Human Magicians, for one reason or another, but those are considered somewhat incomplete.

• Orchestrator subclass allows you to control many creatures at once, be that constructs or conjured familiars.
• Elementalist subclass allows you to dive into eastern alchemy and combine it with powerful elemental spells that get bonuses based on astronomical variables (in-game - decided by player on Long Rest).

Because of how they treat magic, some Magicians say that Outside World science is magic - not because they don’t get it, but because they consider them one and the same.

On that note, Technologist subclass allows you to make technology and magitech. It’s still a Wizard subclass, but with flavour of tech and some mechanics.

Official subclasses can also be used. For example Evoker is a generally good choice for this battle-filled setting.