Glyph of Lesser Elementals [Elementalist Utility Skill] allows you to create more elementals. You are able to have up to 5 elementals.
Flame Barrage [Elementalist Elite Skill] instructs your Elite elemental to deal additional damage and causes Burning.
Firestorm (Glyph of Storms skill) (Glyph of Storms Glyph of Storms skill when in Fire Attunement) [Elementalist Utility Skill] will provide a large dps increase at the cost of a lengthy cooldown.