They could be found standing by the entrance to Saradomin's camp, regularly bombarding Zamorakian units based on a percentage of their health, to great effect. They use a mix of high-hitting and accurate long ranged attacks and stomp on their target when it is at their feet. Up to two of these units may spawn at once, due to a previous buff from a vote. Defeating one gives the player 6x their multiplier in divine tears. Players who aid in killing a colossus are also rewarded divine tears.
Like all special units, they do not retaliate against players unless they are not currently under attack or are attacking any other target.