I don't know anywhere near enough about Etrigan or Carol to chime in on the specifics of how these two match up, but some of the comments seem to seriously be underselling Carol. She seems to be functioning on a WAY higher level nowadays than she was back when Rogue absorbed her powers. She may not be the top female in Marvel, but even back in the day her durability was one or two steps up from her power output so I really don't see anyone other than a serious heavy hitter one shotting her or anything like that. I mean she has slugged it out with guys like Wonderman on more than 1 occasion. And that's not even counting the potential of her absorbing his blast to power herself up even further(assuming his blast fall into the category of something she can absorb of course, not sure what her limits are on that kind of thing).