Darius could see more guards approaching. Whether it's a coincidence or someone had tripped an alarm of some sort, what mattered right then and there was that they were running into more guards. Beyond the soldier that he prepared to strike, he saw a stairway up, guarded my more guards. But he did not care for that right now. His focus was on dealing with the soldier in front of him, at the doorway. The tome, despite it's tattered form, started to glow and he could see the tendrils of darkness slam into the guard. They force their way into his body and start ravaging him from the inside. The soldier does not even get a chance to scream as his body body spasms and writhes from side to side before eventually falling limp, a fine black mist seeping out from the armor, the elder spirits having practically devoured his body. Nothing remained of the guard as the steel shell clatters to the ground, Darius' tome returning to it's old and worn form.
"Hmph. While I don't exactly appreciate such displays of power, at least it happened at a time where I can not complain. Here's hoping the other guards are too intimidated by this display to do anything."