List them if you got 'em!
Tython: Forge Remnant.
Level 9. Name is Fleshraider Conquest Droid. 14000 HP. No idea on numbers of newbies.(Not a world boss in the true sense, but a 14000 HP mob in a newbie zone is not trivial...)
[smg id=83 type=full]
Coruscant: Old Galactic Market.
Level 18. Name is SD-0. Roughly 200,000 HP. Requires at least 16 guys on level or thereabouts.
[smg id=82 type=full]
Taris: The Brell Sediment.
Level 21. Name is Subject Alpha. Roughly 330,000. Requires at least 16 guys on level or thereabouts.
[smg id=81 type=full]