As long as the court mage has access to its spellbook, it can prepare different spells from its spellbook over the course of a long rest , up to 17 spells total. Variant: Familiars: Any spellcaster that can cast the find familiar spell (such as an archmage or mage ) is likely to have a familiar. The familiar can be one of the creatures described in the spell (see the Player's Handbook) or some other Tiny monster, such as a crawling claw , imp , pseudodragon , or quasit . 5.