Gandalf automatically succeeds for Fellowship; Eye automatically succeeds for Shadow. The other symbol counts as 0, plus the d6 total. Each d6 showing 6 is one Tengwar. Advantage keeps the better d12 for the selected side.
Choose once per roll. Adds dice without rerolling existing dice.
Tengwar rows are joint probabilities: success AND exactly that many Tengwar, not percentages conditional on success. Eye means the kept d12 is Eye, including with Advantage. Values are rounded; <0.01% means possible but very rare. After a roll, Hope odds keep the actual rolled dice fixed.