Training Melee, magic, and ranged combat skills in the Abyss is one of the higher exp/hour AFK training methods in Runescape granting 500k-600k combat exp/hour.
we'll be sure to let you know as soon as we can. As for the downtime, we're discussing Make Good options for our players. We know this will have impacted plans you had in-game. Thank you again for your patience, and rest assured we'll get you playing again as soon as possible....