Deathless was a Dwarven sword belonging to Thorin II Oakenshield by at least the year TA 2770, when Erebor was sacked by Smaug. Thorin used the sword afterwards in the Battle of Azanulbizar and in the early stages of the Quest of Erebor, but discarded it upon coming into possession of Orcrist in the Trollshaws.
The sword was created for Peter Jackson's The Hobbit: An Unexpected Journey and as such is non-canonical.
Dimensions :
Lenght: 700 mmWidth: 110 mm