Gothic II/Thieves' Guild

Constantino's Ring
You receive this quest from Cassia once you locate the thieves' guild and decide to join them.

The ring is in the locked chest next to Constantino's bed. Wait until he is asleep and then sneak into his room. You need to have both the Sneaking and Lockpicking skills to accomplish this.

The Blood Chalices
Cassia gives you this job one you join the thieves' guild.

These are the locations of the six chalices:
 * Bromor has one in the chest next to the house entrance (he does go to sleep eventually)
 * One is in the house next to Salandril's shop (the key is on the fireplace). This one is a bit difficult, because even after you bribe Wambo, the other guard almost never seems to leave. But you can easily snatch the key during the day and sedate the guard with a spell.
 * Upper floor of the Paladin headquarters. You can take it any time.
 * Gerbrandt's house. One of the lanterns opens a secret room. The paladin never leaves but he does not see as well as you would expect.
 * Valentino's house.
 * Judge's house. Press the wall shield on the upper floor to open a secret room.