During which war was Shantel Othreier destroyed?
Here's what the lore says, drawn directly from the indexed sources:
-10100 DR * Shantel Othreier is destroyed by Ilythiir during the Fourth Crown War.
Source: -10100 DR
-10110 DR * Circa: The dark elves of Ilythiir use enslaved dragons and other powers to burn Shantel Othreier. In half-a-century, over 70% of the forest is destroyed. In Illefarn and other neutral and free areas, over 1000 priests and High Mages react by spending decades in prayer to Corellon Larethian and the Seldarine, begging for salvation.
Source: -10110 DR
-11450 DR * The Sable Wars: Aided by a few allies from Keltormir and Shantel Othreier, Eiellûr and Thearnytaar invade Ilythiir, aiming to reform or conquer the dark elves before they destroy any more realms. Over half their forces are wiped out by the dark elves' corrupt magic.
Source: -11450 DR
-10700 DR * Third Crown War: The Battle of the Gods' Theater is fought, one of the greatest and bloodiest battles of the Crown Wars. Over 70,000 elves die as an orc horde falls upon the battling armies of Aryvandaar and Shantel Othreier. Aryvandaar is victorious and occupies the northern half of Shantel Othreier.
Source: -10700 DR