He trades magical items and trains mana, and gives a reward (Ring of Dexterity / Ring of Strength / mana potion / scrolls) only after you deliver the Fire Mages' letter and Corristo sends you to him.
Old Camp castle, the fire mages' quarters — Chapter 1: A Fire Mage who hands out the reward for the delivered letter and sells magical items.
A Fire Mage, so killed in Chapter 4 alongside the others when Gomez turns on the order ("Flames to the Flood").
Items Torrez sells in Gothic 1 Remake.
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2Torrez can be found in the Old Camp (Fire Mage).
You: Corristo sent me. I delivered a letter from the outside, and he said you'll give me my reward.
Torrez: A letter from the outside? Then you did us a great service. This is what I can offer as a reward - choose wisely.
You: I choose the Ring of Dexterity.
Torrez: Hmm, speed often beats strength. A wise choice.
You: I want the potion.
Torrez: Well chosen - that was the most valuable item of all. Drink the potion, and it will strengthen you.
You: Give me the scrolls.
Torrez: Very well. Use them wisely - each can only be cast once.
You: Give me the Ring of Strength.
Torrez: Hmm, just what I expected. Here - it is yours.
Torrez: Welcome to our circle, brother.
Torrez: Knowledge is power - so earn it.
You: I have a letter for you. But I want my reward first.
Torrez: Then you should speak to Milten.
You: I already have. Corristo said I'll get my reward first.
Torrez: ... I see. Well, I have something right here. But first, show me the letter.
You: Here it is.
Torrez: Thank you. Take this - it's a ring that will make you more powerful. It is more than what we'd usually give our messengers, so show some gratitude.
Torrez: Now go.
Torrez: What's that? The seal's been broken!
You: Accidents happen.
Torrez: Do they? In that case, this potion is all you'll get. Be grateful - nosy messengers normally get nothing.
You: Thanks. I'm just looking around.
Torrez: An inquisitive soul - how commendable. I'm Torrez, and, as you can see, a servant of Innos. I also offer magical items to select customers.
You: I want to strengthen my mind.
Torrez: Very well.
You: How are things?
You: I'm looking for magical items.