Help: "nearby monsters" and hall of grandmasters

I found the hall of grandmasters pretty straightforward except for the very last foe, the spider queen by Demi, which I couldn't damage. (She couldn't hurt me either, but I gave up after half an hour, and so never finished the map.)

What I don't understand is this: I've specced into the chieftain ascendancy skill ramako, which works just fine with everything I've ever encountered. But this demi character takes almost no damage from me, and I'm definitely standing still (she can't hurt me at all), so I am wondering if there is some sort of bug that she is not considered a "monster"? I can't otherwise explain what mechanic prevents me from damaging her with searing bond.
Any ideas?

They're not monsters, no.

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imanubcake wrote:

They're not monsters, no.

Ah ok interesting thanks. Then I assume she has exceptional fire res and regeneration I cannot counter with that build whatsoever.