The word despertasteis is the preterite form of despertar in the second person plural.
See the full despertar conjugation

despertar

¿De verdad despertasteis a Roc cantando una canción?
Did you really wake up Roc by singing a song?
Cuando despertasteis, puede que se pusiera en contacto con vosotros.
When you woke up, he may have reached out to you.
Entonces me despertasteis para decirme que mi mundo había desaparecido.
Then you woke me up and told me everything that meant something is gone.
¿Por qué no me despertasteis?
Why didn't you awaken me?
La única razón por la que pegué un bote fue porque vosotros me despertasteis.
The only reason I jumped is 'cause you guys woke me up.
Entonces, vuestra merced, me despertasteis.
Then you woke me, out of mercy.'
¿No os despertasteis? Tendrás hambre.
You didn't wake up?
Aunque los Oscuros estaban extendiendo cada vez más su control sobre vosotros, entrasteis en la Luz y despertasteis a lo que estaba ocurriendo.
Although the dark Ones were increasingly extending their control over you, you took in the Light and awakened to what was happening.
Que os despertásteis por la mañana y yo no estaba.
That you woke up in the morning and I'd gone.
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