Simple Q&A (By RAW) III

[Zherog]

Q436.

The retributive amulet (BoED p.116) is an amulet that divide the damage between the attacker and the wearer. If the wearer have damage reduction (let's say, for an example, a barbarian or a vampire) does the damage reduction is applied before or after the retribution?

In my opinion, any DR possessed by the wearer of the item would not apply. The damage isn't from a weapon - it's from a magical effect.

Q437

What's the caster level of a ring (i.e. the ring of telekinesis)? Is it the hit dice of the player/monster? the level needed to create the ring?

The caster level of a ring is whatever is listed in the entry. In the case of the ring of telekinesis, the caster level is 9th.