I come up with some bricks and cement and repair the wall and remove any poisons.
The bricks also happen to be made of diamond giving it triple max HP.
Diamond Wall:
Hp: 20,000Immune to: Black holes, Manbearpig, forcefields, 3 moves per turn, Shoop da Whoop, supernovas, Chuck Norris, planets, bigger walls, nukes, earthquakes, combos, anti-immunities, cannons, Jackie Chan, Darkeagle, Tiger Woods, hobos named Bob, wrecking balls, antimatter, munchers, 2012, Guitar, Military peoples, thinking, Fantastic contraptions, diseases, Mario, Nukes, lightning, crowbars, Gordon Freeman, Skeezix, assassins, Indiana Jones, boulders, massive drops, lava, badges, your mom, Jack Kevorkian, monsters, aliens, rickrolls, communists, Spongebob, asteroids/meteors, Jonas Brothers, squrtle, big machines, Patrick Star, hyper beam, mudkips, pi, explosions, pokemon stuffs, commercials, barfing, balls, tanks, post counts, rail guns, combinations of animals or other things cleverly smashed into one word, paper, superman, the sun, time travel, god, crossing the beams, aliens, star wars, being killed, Falcon pwnch, kraken, malware, viruses, land mines, the middle east, tnt, soldiers, jackhammers, lasers, nanobots, strange matter,