You can talk to him in front of Royotia's pub when hired to get his parameter bonus. Note that you need to hire and talk to Sibal to unlock the last conversation with Maddox.
After the events at Numor Mine, complete the quest The Rainbow Bond. Can be recruited at the Union of the Golden Chalice guild in Royotia.
- "Don't let my age fool you!" (when checking stats)
- "My old age hasn't stopped me from growing"(when stats increase)
- "Forward! We'll just have to plow through what's in our way!" (when selecting a command)
- "I'll take you down with my own hands!" (When facing weaker units)
- "A new power! Guess I'm not senile quite yet" (after upgrading an art)