The Spy Glass is purchasable if you have an upgraded Guild Store to level 4. You can buy it at the Guild Store. Once you have a Spy Glass, you can get a Sneak Peek at the enemy fray assignments.
A Spy Glass allows your guild to see other guild's Fray assignments before Brawl combat begins. To get a tactical advantage, navigate to a guild's Brawl page during the Prep Stage to spy on your enemies.
Each use lasts for one Brawl period.
Purchased Spy Glasses activate automatically for all guild members at the start of the next Brawl, unless your guild's Brawl Status is paused.