The Hydra is a pair of 2x3 missile pods mounted on a tank chasis painted with a camouflage pattern. It attacks by firing 4 volleys of 2 missiles at its target despite only having 12 individual missiles on its model. It is the slowest of the ground vehicles and has the second lowest health of all ground vehicles, but makes up for it with having the longest range and second highest damage per second out of all the ground vehicles. 

It's a very powerful unit with a powerful attack. It's great for war and to increase your battle rank. Of course , it costs 8,000 steel with no upgrades and when fully upgraded costs 47,880 steel, which makes it the most expensive ground vehicle in the game.