Inaros commands the power of the desert. His abilities allow him to disrupt and drain enemies of their life force. He is also an extremely durable warframe with no shields but with a very large health pool.
Inaros’ passive is Undying. While regular warframes go down into a bleedout state, Inaros enters a sarcophagus. While in this state, Inaros can aim at enemies or allies to siphon life from them, filling up his revive meter, allowing him to resurrect himself. If the enemy Inaros is siphoning from is killed by an ally, it will still count towards his revival. He can also be revived normally by other players. However, Inaros cannot move while in the sarcophagus. In addition to this, Inaros will restore a percentage of his health whenever he kills an enemy with a finisher attack.
Ability Strength mods affect the initial damage and damage over time of Desiccation, the damage of Devour and Sandstorm and the damage and healing of Scarab Swarm. Ability Range mods affect the range of Desiccation, the cast and tether range of Devour, the radius of Sandstorm and the casting range and healing aura radius of Scarab Swarm. Ability Duration mods affect the damage over time duration of Desiccation, the quicksand duration of Devour, the energy drain of Sandstorm and the duration of Scarab Swarm.
So, all things considered, here are some builds you may want to try on your Inaros: