Seggrit is one of the few merchants serving in Haven after the Conclave is destroyed. Once the Inquisition has been restored, Seggrit agrees to help them, offering various supplies at what he claims is a discount.
This section contains spoilers for: Dragon Age: Inquisition.
When the Elder Oneattacks Haven, Seggrit becomes trapped inside his burning house. As the Herald retreats to the Chantry, they may be able to rescue him before he is consumed by the flames. If he is saved, he will travel with the rest of the Inquisition to their new base at Skyhold, though he will not set up shop. Instead, he can be found wandering around Skyhold, complaining about how he has been replaced by another merchant.