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Conquered. Thank you guys who advised me to max stag knight before cold heart. This is a huge mile stone for me. Can already see that spider den won't be so easy.

I did hesitate to take sag knight because of affinity problem, but he wasn't supposed to be a damage dealer and his debuff seems to land unless it is a weak hit. Also he is in bolster armor so it is a big help passing waves before the dragon. :)