Should I equip this Fafnir?

if you have gollux set you also get 30% ignore def

there also professional 10% ignore def if you have max ambition

also inner ability can get that too

some char card effect give ignore def such as 3 pirate set also beast tamer give ignore def too

look at emblem / 2ndary weapon or shield potential and bonus potential might has those ignore def you might miss out

I've got a Tyrant Belt instead, and no second pendant slot, so it's not Gollux.
I also don't have a Pirate card set, and I completely forgot about Tamer's card, I've got that for however much it gives as well.
Also completely forgot about Ambition too, got that maxed a long time ago. IA is complete junk and I'm still working on that.
Neither Emblem or Shield have PDR on them either.

If there's any other info needed, I can look that up and add it later.