The Hammer Stromling is a Stromling that uses a hammer as its weapon.
Hammer Stromlings make their first appearance in Avant Gardens Survival. If players are skilled enough to survive for thirteen minutes, Chainsaw Stromlings will stop spawning and, in their place, Hammer Stromlings wearing Lockjaw Helms will spawn instead. Hammer Stromlings are the most dangerous of the three Stromling variations in Avant Gardens Survival, with 8 Life and attacks that inflict 5 damage.
Originally, the Hammer Stromlings in Avant Gardens Survival were simply identified as Stromling. When Return to the Venture Explorer was first opened, Hammer Stromlings and Hammerhurl Stromlings in the instance were both called Hammerlings. They received their current names on February 23, 2011 with the Battle of Nimbus Station update in order to better differentiate the two variations.
Early gameplay videos for the Battle of Nimbus Station show that a Hammer Stromling variation known as the Hammerling Brute would have appeared, while standard Hammerhurl Stromlings were still identified as Hammerlings. Additionally, an unreleased Hammer Stromling variation that wields a mace is heavily featured in Battle of Nimbus Station artwork and misused as Hammer Stromling artwork for the Hammer the Hammers mission.
As the Battle of Nimbus Station is based upon the "Answer the Call" LEGO Universe trailer's Battle of Zorillo Plaza segment, it is likely that Hammer Stromlings are intended to fill in the role of the original Grumpy Darkling, which appeared in the trailer but not in the Battle of Nimbus Station.
The Return to the Venture Explorer style Hammer Stromling helmet, known as Objects_10465_name, was sent out to players' Mailboxes by a Mythran shortly before LEGO Universe closed.