Darren was the local horde king in charge of the Tahoe area. And though he had seized a domain that was worthy for an undead of his status, aka a mid ranking Tier I Horde King, misfortune befell him shortly thereafter.
Eliza's territory had been the one connecting Darren with Bartholomew, in other words, she had stood in the way between him and his other siblings. This was fine while Eliza was around to control her domain.
Yet a few months ago she had perished at the hands of the Living. And with her death, her domain became gobbled up by those wretched insects known as humanity. Without safe passage through her territory, Darren and his horde were quite literally trapped in the Tahoe area, forced to wait out the storm until one of his other siblings could deal with the human settlement founded upon the ruins of Eliza's former domain.