Mini-Boss on Floor 20

Elsewhere in Eathen Keep, Jack found himself in a small passageway but it wasn't natural. On earlier floors, Jack had noticed that some creatures had created new burrows and passages to the floors above and below the usual level they were found on. He learned that first hand, nearly walking headfirst into a nest of Earthen Centipedes between the ninth and tenth floors. 

Albeit narrowly, Jack had avoided alerting those centipedes but took that knowledge along with him. It led Jack to wonder if he could do the same thing. And now that he was about to enter the twentieth floor, Jack felt better in attempting such an experiment.

Jack combined Phoro's and Dragov's bloodlines as he tunneled through the ground with unrivaled speed.

His experiment proved successful as he broke through to the twentieth floor without any issue. However, the rubble would easily attract the mini-boss on the twentieth floor.