Stormcaller is encountered in the twelfth chapter of Darksiders Genesis. You will face him at the end of the chapter.
If you have the opportunity, start the attack by using Chaos/Anarchy. This will greatly weaken the boss and kill his minions.
Stormcaller can cause lightning that is easy to avoid. However, if you get hit, it will stun you for a moment.
If you have the opportunity, get rid of the minions first. They attack more often than the boss himself.
Stormcaller can also shoot beams of electricity. If you stand in front of him, you will be an easy target.