The Arcane Deck is a large deck of cards neatly packed into an ornate box which seem to shuffle themselves when in this container. Every card contains a verbal description & illustration of a spell. If a card has not been drawn from the box in 3 hours drawing a card casts the spell described on the card. To control the spell (choose where the fire shoots, where the portal leads to, stuff like that) the person who drew the card must roll a d20 & add their spellcasting modifier, if they are not a caster they add their intelligence, the dm will determine the outcome of the spell based on the player's intent & the resulting number.
What spells are in the deck is determined by the dm. The dm is not by any means restricted to these two options but there are two interesting ideas for coming up with what spells to put in there. Firstly is theming the deck like perhaps it belonged to a lich & is full of necromantic spells, or it came from the fire plane & it's full of fire & heat based spells, or spells of a specific warlock patron, etc etc. Second is to have it based on spellcasters around it & spells cast around it, like it could based on the spells of the party, or even gain & lose spells by what the party encounters. One interesting spin on this is that it gains every spell cast within 60 feet of it without significant physical obstructions, & only ever gained the spells it had when the party found it via people casting near it.
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