A gift from the Lotus to commemorate the awakening of the first Tenno from Cryo stasis.
The Dex Dakra is a unique dual-sword melee weapon released in celebration of Warframe's 2nd Anniversary, and given to all players who logged in from March 25, 2015, to April 1, 2015. As an anniversary weapon, the Dex Dakra comes with its own weapon slot and pre-installed Orokin Catalyst. They were re-released from March 22, 2016 to March 29, 2016 alongside the Dex Furis and Dex Sybaris. Another re-release of the Dex Dakra, Dex Sybaris and Dex Furis occurred during March 24, 2017 to March 27, 2017.
The Dex Dakra's slam attack does not knockdown enemies, it instead deals Impact proc on affected enemies, stunning them briefly. There also seems to be a chance of a Blast proc instead of an Impact proc.
The Dex Dakra is currently the only dual melee weapon that consist of two swords unlike the traditional one blade one knife dual wield.
In multiplayer, when you have the Swirling Tiger stance equipped, continuous melee attacks with the Dex Dakra while holding the forward movement key (Default: W) can sometimes cause you to go backwards. Releasing W while attacking can fix this. - Tested between updates 20.0.2 (24/03/2017) and 20.1.0 (05/04/2017)