Ah, it's been a while since I've posted a topic. Hope you all didn't miss me.
So, we know that Kandra spikes are unique to them and that they can't accept another Kandra's spikes. This is probably because of Identity, similar to how metalminds only work with their user. However, we see Bleeder use two new spikes that were not her original, made out of trellium, a god metal. So how is she able to do this, despite the problem with identity? I have two theories.
1. Trellium is an alloy of a Shard's god metal and whatever Paalms original spike was. This would explain why Paalm has two that she uses despite having access to more (Which she uses to create chimeras), and why they are still useable for her. (The metal most likely being copper, as Paalm was third generation, and from Tensoon, it appears the third generation was created with blessings of presence, which needed copper spikes (This is also based on my assumption that generations were made with one type of spike.))
OR
2. Trellium's special ability has to do with identity, allowing bleeder to use it despite not being keyed to her identity, like that of an unkeyed metalmind. Seeing as every godmetal seems to have one unique capability (lerasium creates mistborn, atium is the best metal for hemalurgy, acting as a wild card, tavatsium is incredibly hard and can cut your soul, etc.) this would not be hard to believe, and would also fit in with all the identity and connection shenanigans going on in Mistborn Era 2 magic system.