Skill Cards are a feature in Tales of Your, they’re special items that can either be bought or dropped by enemies after being defeated.

To understand how they work, think Pre-Gen 7 TM’s from Pokémon. If you don’t how TM’s work (Skill Cards work in the same way expect instead of a weird disc uses GENSOKYOIAN SPELL CARD TECHNOLOGY!), they work like this. Simply select the item and use it on the party member you want (Say, giving said party member Fire III) and presto! You can use Fire III now!

Skill Cards allows you to give party members magic attack that they can’t normally use, allowing for some nifty strategies.

Hope you enjoyed this little tidbit!
-Frank