Resistance to the poison in the Cave of the Conqueror can be bought from the Hefei Hermit, or granted via a tome (Antidote of Cave) as a learnable skill.  Both give one hour of complete resistance, but the skill allows one to re-cast at will within the limits of cool-down.  As at May 2014 the tome sells for 1kk - 2kk, and is quite rare. There are no level, clan, or class requirements on the tome.

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