Canoptek Spyder - Necrons - Warhammer 40kWhen it comes to ferocious mechanical constructs, you can't get much nastier than a Canoptek Spyder. If it isn't tearing apart enemy infantry or tanks with an array of hooks and blades, then it can be used to repair your damaged vehicles. The icing on the cake (or the chip on the circuit board whatever the Necron equivalent of cake is) is that, even in the heat of battle, it can spawn Canoptek Scarabs to boost your war efforts and irritate your foes.