Vile Eyes are easy to find in the Rotwood Depository, near the entrance. Slay the 3 Vile Eyes, run back to the entrance, sleep in Cassardis for 7 days, then return and slay another 3 Vile Eyes. Repeat this process four times in order to complete the quest. Because the Resting Bench near Olra only advances time by one hour, it is necessary to sleep outside of Bitterblack Isle in order to advance more time.
Strider vs Archydra in the Chamber of Hesitation
A Strider demonstrating Downpour Volley's effectiveness against Archydras with a Dragon's Ire bow. Hard mode demonstration with no armor, buffs, curatives or Wakestones used.