Dark Ones are Stromlings that inhabit Portabello.
The Dark Ones guard the passage up Mount Draak in the center of Portabello. They guard the Starfly Key, which
Zaggle sends players to recover in order to free the Starflies at the mountain's summit. Dark Ones only have 2 Life and their melee spin attacks inflict only 1 damage to players, making Dark Ones easy to defeat.
Dark Ones originated as Hyper Darklings, enemies found in the
Vanguard Outpost, at least one early version of Gnarled Forest, an early version of Forbidden Valley, and likely other worlds. Like other Darklings, Hyper Darklings would have been spawned by Maelstrom Shards.
On January 28 and 29, 2012, Dark Ones were spawned by a Mythran in Nimbus Plaza. The Dark Ones did not attack players and, in return, could not be smashed.
HUD icon from Forbidden Valley
Hyper Darklings in the chat logs of a Vanguard Outpost screenshot
UltraHypnoToad - LEGO Terminator
Hyper Darklings in Gnarled Forest (0:34)
A Hyper Darkling in Gnarled Forest
Hyper Darklings in Gnarled Forest
A Hyper Darkling in the background of an early Forbidden Valley screenshot
A glitched Dark One with a Hyper Darkling
LEGO Universe DEV Walkthrough - Unreleased Version - Part 35 - Test400
Hyper Darklings in a test map