It is said, AT are half-wizards who know their spells so well they don't need a spellbook to cast them. Wizards can read and write down spells, make Scrolls or copy them.
Can these perfect entities write their own, well-known spells into their spellbook by heart?

My example:

I have a 9AT/1W character.
My AT knows the Sleep spell and my spellbook contains Charm Person.
After I leveled up as AT, I have an option to change one of my spells to another one which is illusion or enchantment.

Can I change Sleep to Charm Person, meanwhile I write Sleep in my spellbook?

In this case, I don't lose any of my spells but I can prepare other, more useful spells as a Wizard and Charm Person will be always "prepared".
I could do the same if I changed the spells anyway and then bought a Sleep scroll somewhere but this is more time-consuming and illogical.

  • 3
    \$\begingroup\$ Related: Can a multiclass Wizard/Fighter (Eldritch Knight) add EK known spells to the wizard spellbook? \$\endgroup\$
    – Sdjz
    Commented Jul 4, 2019 at 11:00
  • \$\begingroup\$ Welcome to the site! You can take the tour as an introduction to the site or check the help center if you need further guidance. Good luck and happy gaming! \$\endgroup\$
    – Sdjz
    Commented Jul 4, 2019 at 11:02
  • 2
    \$\begingroup\$ Because Eldritch Knights and Arcane Tricksters are basically the same with regards to their spellcasting, I've marked this question as a duplicate of the other (which is no bad thing, since others who want to know about AT/Wizards can now find the other answer via this question). If the other question doesn't answer yours, please let us know (e.g. you can ping me by including @NathanS in a comment) so that we can try to differentiate between these two questions. \$\endgroup\$
    – NathanS
    Commented Jul 4, 2019 at 12:10


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