Sorcerer subclass: Wizard
1st:
spellbook: you gain a spellbook that helps you memorise and comprehend additional magics, it can be used as an arcane focus, you know additional spells equal to your INT mod and you may also swap out INT mod number of spells after a short or long rest, you can replace PB+INT number of your spells known for others on any base spell list of an arcane caster, if your spellbook is lost or destroyed you loose access to these features until you perform a 1-hour ritual to replace it.
ritual caster: you can cast any spell you know that has the ritual tag without a spell slot by casting it as a 10 minute ritual, also by expending [spell scribing value] you can copy any ritual spell you know into your spellbook so that you may perform it as a ritual even if you don't currently know it, if you have to replace your spellbook you need to re-scribe any rituals in it to use them while not known.
6th:
expanded knowledge: you become proficient in the arcana skill, if you are already proficient gain expertise in it instead, you also gain proficiency in two other INT skills, you have advantage when rolling checks for these three skills.
14th:
empowered upcasting: when casting a spell you can increase the level of the spell slot being used to cast the spell by expending 2 sorcery points per slot level. (so say, you can cast a 7th level spell with a 5th level slot and 4 sorcery points), you can't upcast a spell above your max spell level known.
18th:
greater memorisation: you can replace all spells known over the course of a long rest.