Instructions
Use the Force Commander's Battle Cry ability. This should be reused every 60 seconds.
Stun Ulkair by casting Jonah's Smite, Cyrus' Drop Smoke and Tarkus' Feel No Pain abilities in succession. The Force Commander's Battle Cry also stuns Ulkair when used. Each ability has a reuse timer. Wait until the stun from the previous ability wears off before casting the next one to maximize the amount of time Ulkair is stunned.
Use Tarkus' Tactical Advance ability to render him and the Force Commander invincible as long as he has energy to maintain it. The Force Commander's Battle Cry ability, in addition to other effects, regenerates the energy of his allies, which helps to maintain Tactical Advance for extended periods of time.
Attack Ulkair with Tarkus and the Force Commander using melee weapons.
Cast Ignite Soul with Jonah to do damage to Ulkair whenever this ability is available.
Use Remote Detonation Charges with Cyrus to help damage Ulkair.
Heal damaged Space Marines using Stimulant Kits with Cyrus. Due to one of his abilities, he is able to use kits with only an energy cost. This means he is not limited by the number of kits you have.
Revive any Space Marines that fall using Jonah's Purify ability.
Revive Jonah using a Stimulant Kit with Cyrus, if he falls.
Repeat Steps 1-9 until Ulkair runs out of health.