Magnamire

It hauls its heavy, metal-crusted bulk through Donar's low ground, and its powerful magnetic field drags loose iron toward it for meters around, so that a Magnamire is forever growing its own armor from the debris it pulls in. It hunts by seizing metal-bearing prey magnetically and reeling it in, helpless, to be enveloped. That same field wreaks havoc on anything mechanical, and the Power Tower's engineers have learned to note where the local Magnamire roams and to keep their instruments, and themselves, well clear of its slow, iron-hungry rounds.