Legio Tertius

Legio Tertius is one of the bosses in the Monastery of Ascension. Accessing him requires an Ascension Keystone Tertius.

Like all the Legiones, he attacks by throwing energy on the floor, which damages players who step on to it and attacks with a basic magic attack. He also has a unique ability, which is to summon other ascended to aid him. He summons three Rorarii at 75% life points, one Gladius at 50%, and finally a Capsarius at 25%. Once the capsarius uses it healing buff on Tertius, it will need to be killed - but it is possible to kill Tertius before the capsarius focuses on him, using a combination of high level weapons and powerful, well-timed abilities. The ascended he summons do not drop anything. When Tertius dies, all his summoned ascended also die.

Keystones
All keystones are tertiary drops.

Trivia

 * Legio Tertius is roughly Latin for "Third Legion". However Legio is a feminine noun, while Tertius is a masculine adjective; the correct form would be Legio Tertia. Legions were the largest units of the Roman army and there were 6 in a whole army, hence there are six legiones in the Monastery.
 * Legio Tertius' summoned ascended did not die with him prior to an update on 29 June 2015 - players had to kill them after he died, or leave the room and create a new instance.