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Flame Leviathan is not included in this guide simple because you do not use anything from your class for the encounter, so instead we move right on to Ignis.
First and foremost, Ignis is Immune to fire damage. That means that the traditional WF/FT weapon imbues will be ineffective. Instead you will want to use a Windfury/Frostbrand weapon imbues This insures that none of your dps is wasted.
Totems that should be used are Windfury (unless a DK can provide Icy talons), Strength of the Earth, Flametongue and Healing Stream. Magma and Searing Totem will not do any damage so don't waste your mana casting it. You can use Mana totem instead if a paladin isn't supplying Blessing Of Wisdom.
For the most part, your job is extremely simply. Wait until your tank has enough threat on Ignis and then start opening up doing your normal rotation. There are two abilities that must be watched out for, Flame Jets and Slag Pot. Flame Jets will interrupt casting for 8 seconds and do damage, even though most of the shamans spells are instant cast its still very important to not cast during that time anyways. Also, when Ignis throws someone in the Slag Pot, be prepared to help heal them with Lesser Healing Wave. And finally, stay away for Brittle Constructs as if they explode near you, you will most likely die. Save bloodlust until Ignis is at about 60% health.