The Everlasting Sapling is the seventh and final chapter of Bug Fables. The Chapter takes place within Giant's Lair and culminates in the final boss fight. It is preceded by Chapter 6: Assault on Rubber Prison.
Team Snakemouth enters the Giant's Lair, a barren place where bugs are said to 'not come back upon entering'. Venus appears again in front of the team, telling them that she is unable to travel further into the place because of its atmosphere, but still offers healing at the beginning of the area.
Upon leaving Venus's area of influence, the team is alarmed by the presence of Dead Lander Ω, and try to take care to not get caught by its sight. After making their way through the dangerous land, Team Snakemouth, Team Maki and Team Mothiva, as well as other travelers meet in front of the entrance to an inorganic frozen mountain, and is suddenly ambushed by some Dead Landers.
After defeating the Dead Landers, everyone climbs the cold tower. At the top, they find a lift that leads to the remaining living Roaches and their villages. The Elder tells the teams that the Roaches guard the Everlasting Sapling because it is sacred, and is the source of all things in Bugaria. Elizant II, having realized how disastrous the pursuit of the sapling has become, and announces that she is going to destroy the Sapling, rather than use its power.
The Elder initially disagrees and forbids the explorers from reaching the Everlasting Sapling. However, after Leif speaks up about the team's experiences, and the terrible struggles that have resulted from the Sapling, they are eventually able to convince the Elder to agree to their plan and allows the teams to enter the Sapling Plain.
The Wasp King creates a wall of fire, and the heat causes the Roach constructs to become aggressive. Team Snakemouth and the other explorers help a roach from the fiery constructs. After succeeding, Team Snakemouth is sent ahead to figure out how to stop the fire. The fire is eventually stopped by Team Snakemouth's efforts and the remaining explorer teams reconvene, preparing for the final battle.
The trio then faces Wasp King with the others right before he reaches the sapling. The Wasp King once again uses his fire magic, but Team Snakemouth survives thanks to the Flame Brooch, and they seemly defeats the Wasp King. Shortly after this, Wasp King throws a Cherry Bomb at the team and unlocks the sapling anyway. To everyone's surprise, it's wilted and there is only one leaf on it. Feeling disappointed, Wasp King devours the only leaf, transforming into The Everlasting King.
Despite all odds, Team Snakemouth is somehow able to defeat the Everlasting King after his power eventually runs out and he loses the control of his body, becoming an ordinary tree. Knowing that the sapling is destroyed, Elizant II feels somehow relieved as she finally fulfills her mother's wishes, and she talks to Leif about this. The Roaches are also free from their mission of guarding the sapling, and begin to explore the world as they wish.
Although the legend of the Everlasting Sapling is now gone, Bugaria is now in peace, and a ceremony for the Team Snakemouth is held at Ant City, with everyone in Bugaria, as well as the Wasps and Termites partaking in the celebration.
Elizant II gives one last speech applauding everyone's efforts, especially Team Snakemouth, and they all celebrate with a feast.