The fourth and final installment of Dungeon Defenders' DLC saga Quest for the Lost Eternia Shards -- "Sky City" -- is now available on Steam for $3.99. As seen in the trailer above, the DLC appears chock full of biplanes, ogres with impractical jet packs, and jewel-encrusted troll dolls from the depths of monstrous terror.

It also includes two new campaign missions (with two accompanying bosses), six new cinematics, a "Catarang" pet, a Boss Rush challenge mission, eight legendary hero costumes, a Sky Captain Initiate costume, 20-plus new weapons/accessories and "even more secrets for the true, Ultimate Defenders," according to the announcement. Those who prefer defending dungeons on their PS3 or 360 will have to be patient, however, as console versions of the DLC are still listed as "coming soon."