school of tattoos

you magic is based on your tattoos and as a result you have a more special relationship with your spells  

ink casting

Beginning when you select this school at 2nd level, the time and gold to learn any new spell is halved but as a result when you do you lose 1d6 max hp for up to 1d4 days you also no longer need a spellbook instead you use your body as your spellbook and your spells are are represented on your body as tattoos.

toughen up

as wheel at 2nd level you learn to power through the pain that comes from your tattoos gain resistance to piercing damage you also add your int mod to your ac

empowered spells

your tattoos have become a extensions of yourself and empower your spells

starting at 6th level when you cast a spell from one of your tattoos you can do a extra d4 of damage ( damage type same as spells)

this increase to a d6 at level 10 and d10 at level 16

it's not just a tattoo it's art

your body have become not just a means to cast spells but a canvas for your creativity

starting a 10th level when you cat a spell you can use the tattoo corresponding to that spell to empower it further. when you cast a spell that does damage you can use this feature (bonus action) to double the damage dice and auto crit on a attack but as a result of this the tattoo is damaged and you can not use that spell again until you take a short rest and mend the tattoo

you can only use this feature a number of times equal to your int mod

favorite ink

14th level ability

you chose one spell from your list of spell that you may cast at will ( free action but once per turn)

increase to 2 spells at 17th level and 3 at 20th level