I remember creeping crud having a yellow background with a black looking ooze coming down as the icon. Also, back then it was a different spell and did stack with the swarm line because it was a different type of spell. I used immolate/swarm/crud on RM giants way back in the day. Sadly, I've done little to no research to prove my theory, but stonewall, your correct in thinking these "should" stack.
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