Ancient Magic, Variant (5e Subclass)
From D&D Wiki
The users of Ancient Magic are extremely rare, for they have come across texts that dot few places on vast maps that detail countries, continents and the world itself, not mentioning if they've survived being eroded over the millennia, buried under oceans or passing through natural disasters that may endanger parchment, paper, ink, anything that may hold onto the past. Said relics depict powerful spells that focus on manipulating physical possibilities laid out by science. To the modern understanding of magic, it seems a crude way to cast, but features its own strong points that are hidden under artistry and lines of an undepictable language. People who've stumbled on this field are the only ones that practice it, for it's unbelievably difficult to trace a location that isn't on any scroll in the first place.
At level two, you unlock the powers that reside in an ancient magical book, decide (perhaps with your DM) the spells that are locked inside and it's special features. Perhaps it slowly floats upwards, or has some violent tendencies and likes flinging itself at cats, maybe faces too?
The Grimoir you hold can be a substitute for a spell book, it will have spells that you don't understand just yet. Although it's your choice to scribble new findings, the magical document often won't allow you to, shutting before even a droplet of ink can permanently tattoo it's body, though this is up to your DM, take into account the grimoire's personality and orgins of the spell. You can take time to learn the archaic knowledge stored inside the covers, though extremely difficult, with hard work its possible to decipher a page or two and put it to practical use. The level of the spell written correlates to how many lines, sides maybe chapters it takes up, making it easy to pick one out and take a crack at.
You can take time to learn a spell from the grimoire, following the table below
Due to the vague connections between magic of the old and magic used today, you can spend a little less time and recourses learning spells from the schools of Abjuration and Evocation.
When you acquire this ability, starting at level two, the time you take and the money spent copying spells from the schools Abjuration and Evocation into your spell book is reduced by one quarter.