The idea is having a player vs bot event in which large player groups fight against buffed elite bots in corrupted maps. (These maps would mainly have alternate textures to make it easier for developers)

These maps would look like they've been damage by a war and have strange looking black veins growing everywhere, the plot would be that these would be from a prototype bio mech that has been getting tested with in these maps. In these maps players have to capture control points just like in any other control point match but against a larger group of bots (10 players vs 20 or so bots) after 2 minutes have passed and enough points hae been gathered it will turn into a death match in which players will have to destroy as many buffed bots as possible for 3 minutes, once the time is over and enough bots are destroyed the match is over.

Players will get points depending on how many control points they've capture compared to others, but also damage done to bots.

The points earned will allow players to buy modules that onluck an alternate version of a specific mech of their choosing. A basic example being the abilities being altered, for panther their mech their barrier ability will cause both a burning and acid effect instead of slowness effect, but at the cost of turning into a barier with health (health will be 15% higher compared to the mech). A mech like eagis could end up having their dome health reduced by half, yet gain the ability to get some health back by killing enemy mechs.... of course these are just examples and it would likely be best if their abilities are altered in a different way.

Altered mechs can be recognized by a colored halo underneath them, being triangles on radar, and lastly a symbol when aiming at them. 

Very basic plot idea: The arena wanted to create a new mech platform for pilots to test their mechs on and fight, these mechs were designed to be easily and quickly build and repaired, each mech weould also react just like you'd expect from an actual person....however something went wrong, as they are being tested they started undergoing a rapid mutation and started corrupting other machines around them. Now to avoid getting in trouble, it has been decided to have the pilots fight against these corrupted mechs before anyone find out about this accident.