Description from original post (created 2016-02-21 20:10):
Above is the Ballista and below is the Heavy Gunner.
Heavy Gunner
Kela De Thaym (Boss of Sedna)
This is one of the most annoying Grineer ever and is the cause of many deaths. They are also responsible for many rages and multiple blades of Hell being unleashed upon the Grineer....
http://warframe.wikia.com/wiki/Ballista