The HV-MTL (Heavy Metal) collection is made up of 30,000 Mechs derived from 8 different Power Source types. Beginning March 15, 2023, eligible Sewer Passes can be burned to summon a Power Source that will reveal an Evo 1 Mech. Evo 1 holders can participate in future minigame sets with their Evo 1s to unlock additional HV-MTL evolution stages. Holders of HV-MTLs are subject to the HV-MTL License Agreement available at https://hv-mtl.com/hvmtl-license-agreement.