Taking a class feature as special rules

[keeper2161]

I love the death mage (https://www.d20pfsrd.com/classes/3rd-party-classes/rogue-genius-games/death-mage/) class feature fetish. It is amazing. Gaining power from defeated enemies to defeat more enemies. But the death mage class not so much. Would it be wrong to have the fetishs as a standard rule in my games? That anyone could grab?

[reddir]

I love the death mage (https://www.d20pfsrd.com/classes/3rd-party-classes/rogue-genius-games/death-mage/) class feature fetish. It is amazing. Gaining power from defeated enemies to defeat more enemies. But the death mage class not so much. Would it be wrong to have the fetishs as a standard rule in my games? That anyone could grab?

I remember an idea of allowing characters to take abilities from other classes as Feats. Maybe you can work up a Feat chain and appropriate prerequisites to making Fetish and the various abilities it brings accessable to non-Death-Mages?