Realm First! Sinestra

Realm First! Sinestra is a Feat of Strength for being the first guild group on the realm to defeat in the Bastion of Twilight. It can be completed on 10- or 25-player mode.
Like other realm firsts, there will be a server-wide notification when this achievement is completed. However, it is awarded as a guild, rather than individual, achievement.
==Patch changes==
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==External links==