Soloing the Warsat as a Defender

Tier 5 Intellect

Saint 14 (The one i used had Inverse Shadow)

Telesto

Void Sword

Void Armor Bonus Increased Fusion Rifle Ammo

For the first wave i recommend not using the Telesto for the red bar enemies. Kill them with Primary/Heavy for special ammo drops.

Take out turrets asap.

Spec Ward of Dawn with Bastion, Blessings of Light, and Illuminated.

Edit: Apologies for not linking the video in the original post. It's here.