Aldor and several other members of the Slayer's Take confronted Vox Machina as they battled a hydra just outside the walls of Vasselheim. When the adventuring band slayed the beast, Aldor angrily explained the contract system of the Slayer's Take and took the group to the guild hall for further explanations and punishment.
"Dangerous Dealings" (4x04) Edit
After returning to Vasselheim following the Chroma Conclave's attack on Emon, Vox Machina saw Aldor in the Slayer's Take guild hall, playing cards with Thorbir. Aldor seemed noticeably scared and anxious when Lyra was mentioned, as if afraid that she might have been nearby.
"The Final Ascent" (8x14) Edit
When Vox Machina were going through their trials to be inducted into the Slayer's Take, Lyra had an immense, even obsessive crush on Aldor. He clearly did not reciprocate these feelings and did his best to avoid her.