This is the first in the line of the AT(attack Terra). A Terra is just a kind of mech BTW. It is faintly reminiscent of an EVA from Neon Genesis Evangelion. it sports two large swords that are arm mounted when in and when not in use, and can be hand held. The last pictures are a family photo, (left to right) IDK-1 upgraded hardsuit, AT-2, and the AT-3. while not physically superior to the AT-2, it is far faster, more agile/maneuverable, and way more stable than its predecesor. unfortunately the AT-1 couldn't make the reunion because of parts scarcity. disregard previous statements.