2nd and 3rd normal attack strike in the combo slams the ground and inflicts AoE damage. The 5th also hits the ground behind you, to the right. This can be used to stunlock certain enemies such as Infested Chargers or simply add elemental procs such as ice or fire, similar to the Fragor.
Highly recommended to use a warframe that has the ability to stealth (e.g. Loki) or way to lower/ignore damage (e.g. Rhino) due to the long attack animations and the possibility to get interrupted easily and the extra damage output dealt to enemies. Also, a Shade with Ghost equipped, can be quite convenient as well.
Despite being the most damaging melee out there, it is not the best choice to perform a raid-style attack.