[No, there's still a chance.]
"I'm listening." Ying became serious as he focused, hearing the voice of the Orc-Dragon Soul resound in his mind.
[The Bone Dragon is too strong to enter this dimension yet. So, it's struggling to come out. As for the Lich, despite its power, its weak in one-on-one combat. So, without the Bone Dragon as its guard, it wouldn't come out either. The three S-Rank Hunter skeletons too form the core unit of its defence. So, without them, the remaining monsters are somewhat tolerable to kill.]
"But…" Ying frowned, "How do I stop the Bone Dragon from coming out?"
He just began to speak when he paused, observing that the crack seemed to be pushing against the Bone Dragon, "I see, so it will close on its own. Then that means…"
He didn't bother asking for any suggestions from the Orc-Dragon Soul after that, focusing as he recalled from his experience, "There is the C-Rank Dungeon full of Lizardmen two kilometres away."