I believe the "Buy" button is to join them in a paid instance of Tarlok's Rift, in this case Tarlok's Lair. Basically your guildmate paid to enter a specific event zone and you can pay to join them.
I believe the "Buy" button is to join them in a paid instance of Tarlok's Rift, in this case Tarlok's Lair. Basically your guildmate paid to enter a specific event zone and you can pay to join them.
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