Gates

Gates allow Drones to consume berries to upgrade to a Combat Class or Power Up. You can choose using the directioanl inputs which one, from the gate you've entered. Otherwise the drone has no combat capabilities, and can only throw berries for defensive action (Or bounce into the enemy and try to push them around before dying).

(sourced from @viotech on KQB discord)

When I take a berry to a gate, why am I not becoming a warrior?
The gate must be either neutral (gray colored) or tagged for you team (blue or gold). [more comprehensive answer about how gates work would be good]