best skill to kill hell baal with javazon?

[Wyrm]

I have heard that mercs and valks are helpful against lightning immunes.
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If you can get your Valk to spawn with a weapon that has 300% ed or more (somewhat easy to tell with weapon color), she'll kill just about any/everything you can't. I'm not sure of the level requirement for that though, I think it's 17+.