The Drenkend are a species of basically sapient tanks, shock troops who are fiercely loyal to their masters, the Scryve. The Drenkend are not necessarily dumb, just extremely easy to lead astray. Obviously the result of genetic engineering, it seems likely they have also been implanted with a need, even a compulsion, to unfailingly obey orders, no matter how ill advised they are.
The Drenkend Carrier exemplifies everything that makes the Drenkend such terrifying opponents: their ability to throw lots and lots of bodies at a problem. Absolutely crammed with Drenkend just itching to fight, the Drenkend Carrier is capable of launching an almost infinite number of boarding craft to ruin an enemy's day. To support their day-ruining efforts, the Carrier also can fire a De-Energizing Bolt, capable of slowing an enemy vessel down long enough for the boarding parties to do their worst.