Thea's only appearance in official artwork from the
Phantasy Star III manual finds her bringing the power of the Wata technique to bear. This is a side we don't normally see from the quiet princess of Shusoran. She gives the impression of being a very fierce opponent in battle.
The name of the technique shown here is a bit confusing. It would seem to be the water technique called Tsu in the English release. The name Tsu was used for energy based attacks in
Phantasy Star II and
Phantasy Star IV, with Wat being the name of the water technique in the latter. Wata may be an attempt at romanizing the Japanese name of Wat, which appeared as Barta in
Phantasy Star Online. See? Confusing.