I just started playing card hunters and bought a really good sword from the shop, when I try to equip it the box turns red and wont let me equip. I've tried unequipping everything and still will not. Thanks for the help
The red box means the item requires a power token (those blue/yellow/orange dots) that the character doesn't have yet. You gain power tokens as your character levels up. Note that if you take a high level character into a low level adventure, they will be temporary de-leveled for that adventure. You can test this by going into your multiplayer keep and trying to equip the item. Your characters will be level 18 there, with 4 blue and 4 yellow tokens available.