Island Expeditions - Tol'Vir

Hello Everyone,

So for two years I have been tracking the board every single week without fail and Tol’Vir has only shown up once. Is there a way to know when the next invasion is planned? The glittering scarab is the last one I need for achievement and the meta but after well over 3,000 Expeditions yet to find one. Just looking for some advice at this point…

Thank you very much,