This random encounter occurs after A Paragon of Her Kind is completed. The party is ambushed by rebel dwarves, loyal to the dead candidate for the throne (either Pyral Harrowmont or Bhelen Aeducan), who want to take revenge on the Warden.
Notable items EditDeathroot
A harmless enough plant on its own, deathroot's thick leaves contain an extract that the Chasind have used to induce hallucinations for centuries. Sufficiently concentrated, it can be made into a deadly poison.