So one of my players wanted to play a Yogi from Sind. Looking at The Champions of Mystara, it is treating all the Sindhi yogins, fakirs, etc. as Mystics. But since it fit neither of our perception of the character and the role he'd play in the party, we opted for a magic-user variant instead, taking the Ethengar hakomon as the base template and tweaking it from there.
Magic-user variant Yogi
by Anarion_ElendiliThey count as magic-users, save for these extra rules (tweaked from Hakomons):
1. Extra +1 hp per level, up to 9th level.
2. Yogis get Willpower [Bravery] specialization, at (WIS+Lvl)/2+3, and +Lvl/6 (round up) to saving throws vs spell effects affecting the mind.
3. Yogis do not use spellbooks, and are indeed unable to learn spells from spellbooks or normal scrolls. Instead, they have tattoos, one for each spell that they know, and they need a teacher or self-study (i.e. when going up levels) to learn new spells. The teacher can be a normal mage, albeit this takes more work than learning from another Yogi. In addition, they can use a mage's magical items without restriction, and can cast spells from a normal scroll if they succeed in Arcane Knowledge skill roll (failures are usually just a fizzle, although fumbles tend to be bad).
4. They have taboos: 1 at the start, and one more every 3 levels. Violating a taboo causes them to lose parts of their powers, make them sick, etc, until they purify themselves with meditation and fasting. People with exposure to Sindhi culture and Yogis might be able to guess what the taboos are (obvious in some cases) and use them against the Yogi. Typical taboos are: Vegetarianism, Forbidden to cut hair or fingernails, Forbidden to ride a horse, Forbidden to enter water...
5. Yogis eschew the use of weapons, and thus instead of using daggers for fighting, they rely on their fists or a stout quarterstaff (their only melee weapon) or simply throw rocks (their only ranged weapon, save for throwing their staff) until the problem goes away. Their emphasis on martial arts allows them to do 1d4 damage with their fists.
6. Yogis eschew material wealth, and tend to donate any extra wealth to their order (or to a charity, if they so choose). This is sometimes not possible, but they will do it at the earliest opportunity. Their order usually rewards them with magical items and training to help in their quest of Enlightenment.