I'm still pondering how it's possible to poison a Vorlon. I'm guessing that our shapeshifter may well be an agent of the Shadows, and obtained the poison from them. I'm supposing that all the Doctor actually did was to remove the poison patch from Kosh and Kosh probably recovered largely on his own; I can't imagine the medlab is set up to handle million year old energy squids.
It's a bit of a misconception that the Vorlons are energy based. Though they're physically powerful as well as and telekinetic and telepathic, they do still have bodies. The impression I get is that they evolved from deep sea creatures, hence the squid/jellyfish/elder thing like anatomy, translucency and bio-luminescence. Indeed, I've often speculated that this is the historical origin of the encounter suit; that back before they evolved/engineered their biology into what we're familiar with, their deep sea dwelling ancestors needed high pressure suits in order to interact with other races. Coming from such an extreme environment may also account for their tendency towards aloof isolationism. Later on they got to the point where they didn't need the suits anymore, but kept them all the same, out of cultural tradition as much as anything.
I mean think about it: on a space ship or station where the environmental conditions are entirely controlled, there's no *practical* reason why humans can't just walk around naked 90% of the time. It's mostly just a cultural thing. Perhaps in a sense it's the same for the Vorlons.
As for how they were able to poison a Vorlon: remember that 1000 years ago the Vorlons walked openly among the Minbari. There may have been some instance where a Vorlon was injured or even killed in their presence and a record of that (probably a *very* guarded secret) could have been kept by the Grey Council. How that information got to the Minbari assassin isn't clear, but given certain other events on the show it's a fair bet at least one of the warrior caste Satai may have been backing the rogue clan behind the attempt.
It's possible the Shadows and/or their agents were indirectly behind this too since the infighting between the castes did ultimately keep the bulk of the Minbari's warriors out of the Shadow War. That's just speculation on my part however.
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