Currently Velk Spiders plus Kobolds share the same faction. It seems that currently every mob in Velk is on a blanket faction for the entire zone, but the Kobolds should be on their own phantom faction, and spiders/golems/gargs on another.
While there is no evidence supporting the above statement, a post from 2001 supports the notion that Werewolf form giving dubious faction to kobolds, but not to spiders. If spiders and golems were included, this person would most likely have written it, but it is not written that way.
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https://everquest.allakhazam.com/db/...9&p=3#Comments
Also would be safe to assume that golems and such around Velk's area see invis, since they are his guardians an protectors.