Calder is a member of the OoMn. He is also the Knight of 1 in the secret squad known as the Knights of Round. Since he is the Knight of 1 he is the strongest Knight of Round. He is very strong and has years of battle experiance. His right hand had been cut off by a Makuta in the very first battle of the Toa and Makuta war. Calder decided to replace his missing right hand with a sword so that he could still fight as he used to. Calder accompanies Vahen on alot of his missions and likes to joke to Vahen about his love towards Toa Athena.