To build an effective chakra user, you'd have to take Psychic Sensitivity at 3rd level...which would give you the ability to use certain skill unlocks right now, but would overall be useless. At Level 4, you'd have access to the Root and Sacral Chakras...assuming a Wisdom of 13, you'd have DR 2/-- for about 5 rounds, or the ability to basically leap tall buildings in a single bound for six rounds. You get access to a new chakra with every even level, up to 14 when you get the Crown chakra. You have to open them in order, and you have to maintain them with a fortitude save before trying to open the next one with a will save.
At level 5, you take Chakra Initiate, which gives you 3 "serpentfire" ki points specifically for the opening and maintenance of chakra. Take Extra Ki at level 7 for the bonus 2 there, and Chakra Adept at level 9 for another "serpentfire" point, plus all the bonus points from your three vows (assuming you kept them, that'd be 9 from poverty, 1 from truth, 1 from silence), and assuming your level 4 or level 8 ability increase went to Wisdom, you'd effectively have 21 rounds of chakra time to play with.
At level 9, you'd effectively be a secondary healer, with the Heart Chakra stuff...healing a minimum of 9 HP worth of damage and getting rid of conditions to boot. At level 15, take Chakra Master to get another "serpentfire" ki point, and gain the ability to use up to three chakras at once. Profit from the ridiculous amount of ki you've earned by having three friggin' vows. (Assuming all three ability bumps go into Wisdom, that'd put your regular ki at 32 and your serpent fire at 5). Become mother effin' Goku.
...sorry. I've been thinking about this a lot lately...actually laying out the numbers and doing the math for it makes it look insane.
