Smallville final episode question

hey guys i was wondering does anyone know what type of arrows Oliver uses in the final episode to put the 3 Darkside minions down? I mean he could not have used just used is normal could he ... as they have super strength and other powers.

I suppose he must have used radion substance to kill New Gods... but since it wasn't previously established in Smallville continuity I am not sure.

That episode seemed rushed so it's no surprise they didn't mention it, unless I'm not remembering it.

I could be wrong (it's been a while since I watched the last episode or rather, season 10 of Smallville), but didn't Oliver use pieces of the Bow of Orion to kill them? I remember the episode where the bow got destroyed, but I'm thinking that was the reason why Ollie was able to.

Yeah, he was down in the caves of Orion's bow afterall so perhaps he went back and got something from there? Or maybe the remains of the bow that Granny destroyed?