This weekend, The Coalition is offering
double Horde class experience in their 25-wave modes. There's Horde Frenzy
, which has random enemies and a boss fight every five waves instead of every ten. There's also Horde Lite, which is an "easier variant with repeating waves."
The event is live now in Gears of War 4
on Xbox One and Windows 10 with no specific end time given.