Serph readily accepts the gift from Jayce. But when he inspects it more closely, his brows furrow in consternation. It has a lot of similarities to the bottle of liquid that Roland had offered Argilla; dark, amber brown glass and a faded label that renders the contents a mystery. He also remembers Argilla being enamoured with the liquid's pretty colour as she swirled her glass, but coughing and sputtering the moment she took a sip.

Roland had seemed fine. If anything, the liquid seemed to have an effect on his mood as he talked with them that first time.

What this is prickles uncomfortably at the back of his mind. Contrary to his past observations, there's a part of him that has has pleasant associations with this kind of bottle.

A useful tool.
(But for what?)

Carefully, he asks, "What is this?"