Chapter 888, "Situation in Greenland", is the clearest early answer because it turns Rune Masters's situation into a concrete plot event.

Chapter 143, "Issues", is the clearest early answer because it turns Rune Masters's situation into a concrete plot event.
Chapter 612, "Deal", is the clearest early answer because it turns Rune Masters's situation into a concrete plot event.
Chapter 939, "The step pyramid", is the clearest early answer because it turns Rune Masters's situation into a concrete plot event.
Chapter 432, "The Second Wave", is the clearest early answer because it turns Rune Masters's situation into a concrete plot event.
Chapter 618, "Beast Armor", is the clearest early answer because it turns Rune Masters's situation into a concrete plot event.
Chapter 526, "Origin", is the clearest early answer because it turns Greenland's situation into a concrete plot event.
Chapter 646, "Fulfilling the promise", is the clearest early answer because it turns Greenland's situation into a concrete plot event.
Chapter 446, "Out", is the clearest early answer because it turns Planet Greenland's situation into a concrete plot event.
Chapter 501, "Giant", is the clearest early answer because it turns Planet Greenland's situation into a concrete plot event.
Chapter 437, "Humans", is the clearest early answer because it turns Planet Greenland's situation into a concrete plot event.