Each race has its own dedicated Element. Elithen – Ice Mossmane – Poison Ragnar – Earth Unak – Fire Human – Physical Vikings – Lightning This means that each race will use one Element to fight with. For an example, the Elithen will shower their foes with Ice and wield Frozen weapons. Elemental dame also means that some Titans will be weak to some Elements. You can give your Titans Relics to boost resistance to certain elements. 
The only exceptions to this are the Unak Boar Titans (Venomtusk, Snowgore and Flamehide)
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Dawn of Titans Game GUIDE