Kevin Landwaster was the last of the Old High Lords of Revelstone, being the son of Loric Vilesilencer, grandson of Damelon Giantfriend, and great-grandson of Berek Halfhand. He gave his name to Kevin's Watch.
As his title implies, he is remembered for giving into despair and enacting the Ritual of Desecration in a futile attempt to defeat Lord Foul, destroying the Land in the process. Despite him having died long before the events of even the first book, Lord Foul's Bane, Kevin's actions serve as a reminder as to what happens when one gives into despite, and thus lead the New Lords to make the Oath of Peace.
Even in death, Kevin is beset by tragedy; his later summoning by Elena in The Illearth War breaks the Law of Death, which has massive consequences that follow well into the Second Chronicles. His grief is never forgotten, and four thousand years later he informs Linden Avery of Thomas Covenant's intentions in White Gold Wielder.
Kevin becomes High Lord and lives for a thousand years. An army of Haruchai enters the Land through Guards Gap intent on conquest but are overwhelmed by the site of Revelstone and the might of High Lord Kevin and the Staff of Law. They swear a Vow to serve the Council of Lords and five hundred of them become the Bloodguard, warders of the Lords and Lord's Keep, losing the ability to sleep or age. Lord Foul pretends friendship with the Council of Lords and is accepted by High Lord Kevin who teaches him much secret lore. Foul sets a trap for Kevin near Mount Thunder but Kevin is mistrustful and sends other Lords who are butchered at the spot known thereafter as Treacher's Gorge. Lord Foul corrupts the southeast regions of the Land which are renamed the Spoiled Plains and Shattered Hills surrounding Foul's Creche. He begins breeding monstrous creatures to be his servants and warriors, starting a series of internecene wars against the Lord's Council which results in widespread death and destruction of the Land.Sickening of the butchery and seeing no respite for the Land or its peoples, High Lord Kevin creates the Seven Wards, giving the First to the Giants who set sail from the Land. He sends the Bloodguard to safety in the mountains and attempts to secure as many innocents as possible before challenging Lord Foul to the Ritual of Desecration. Foul accepts and together they enact the Ritual which temporarily banishes Lord Foul and his Raver servants from corporeal existence and devastates the unprotected substance, creatures and peoples of the Land. High Lord Kevin realizes in the instant before his death that Lord Foul and the Ravers cannot be slain by the Desecration. He dies howling in agony.