The Siege of Somonor was a military campaign fought by the Eldar of Craftworld Alaitoc in 798.M41 against the Necrons of the newly emergent Sautekh Dynasty on the Tomb World of Somonor. The Sautekh Phaeron, Imotekh the Stormlord, played on the overconfidence of the Eldar Farseer Eldorath Starbane to lead the Eldar war host he commanded into a trap deep within the Necron stasis-tomb on Somonor that saw the entire Eldar force exterminated. As a reminder of the humiliating defeat, Imotekh amputated Starbane's right hand, but allowed the Farseer to live so that he could take the news of his defeat back to Alaitoc. The Seer Council of Alaitoc promptly began planning for a major assault on the heart of the Sautekh Dynasty in response.