Argonauts Agency: Chair of Hephaestus

Morningtime in the Argonauts Agency passed by like any other. But suddenly, a courier burst in and demanded the team go at once to famous artifact collector Pelias' manor. When they arrive, they see Pelias is in trouble. Someone secretly delivered a chair to his house, and when Pelias sat down for a rest, shackles burst out and chained him down. How is the team ever going to free him?