Adding perks to a player seems easy enough, but I just can't seem to get it working. Do new perks require a new script, or a script attached to the item? All I'm trying to do is; if a player has item x equipped, give them a set perk.

Do you mean a special unique item or a certain class of items? Like is the perk tied to a special iron sword you plan to place somewhere or should the perk apply whenever any sword is used?

In first case just add a script to that particular item which grants the perk to the player upon the OnEquipped Event and removes the perk again on an OnUnequipped event.

Yep it's a new Item. A shield. I've tried mirroring the default spiked shield with a new spell, and perk but it doesn't seem to work.

Under dunTargeOfTheBloodedPerk (default), all it has under Perk Entries is if it's equipped or not. (which seems right) but when I try this for the new shield its a no-go.