Honor

Spawning in one variant of the map, the artifact can be seen on the far left on the bottom level. You will need either: two rusty jetpacks, a photon jetpack, or to play as the Miner in order to get to it, due to the jumps involved at the entrance (visible, right).

The Miner's fourth [V] skill To The Stars will give him additional jump height if used correctly. The artifact itself is visible from the very bottom, it looks like a purple cube and does not sit on top of the artifact gate, like the others. Picking it up will unlock the Honor artifact, which will make all enemies spawn as elites.