Lord Tedalgrinche first appears in the quests "Securing the Locks" when the machinists succeed in driving off Svara from Skyfire Locks, issuing a challenge to Stephanivien to participate in an upcoming tourney. An unscrupulous knight, Tedalgrinche hires thugs to harass and vandalize Skysteel Manufactory. Despite this, the Warrior of Light and other machinists manage to succeed in the tourney during the quest "The Power of a Tourney."
While this firmly ensured Count Baurendouin's trust in his son's work, Tedalgrinche would not let up on his feud. He holds Joye's father hostage so she would follow into an arranged marriage with a worker at Falcon's Nest; The guard he posted was easily intimidated into abandoning post, allowing her father to convince her to return to the Manufactory. He then resorts to accusing Stephanivien of arming civilians into insurrection, and makes sure to sidestep attempts to prove his wrong-doing. Tedalgrinche informs them the charges will be dropped only by a trial by combat against the dragon Veri Seren, an elusive vouivre who has been plaguing trade routes recently.
On the day of the trial in the Coerthas Western Highlands, an unexpected turn of events leads to the machinists defending Tedalgrinche and an attending priest from Veri Seren and his host. After a long battle, the dragon is defeated, and Tedalgrinche begrudgingly accepts the machinists valor, promising not to interfere with the Skysteel Manufactory any longer.