The Five Sigils (formerly the 5 Seals or 5 Crests) are a set of symbols/markings that must be acquired in Dragon Quest II. By collecting all 5, the heroes are able to summon Rubiss at the Rubiss Shrine and receive the Eye of Rubiss.
The Sun Sigil can be found by searching a specific tile on the outskirts of the Fire Shrine.
The Soul Sigil (formerly Life Seal) is located in a treasure chest on floor B1 inside the Cave to Rhone. In the iOS remake, the King of Tantegel castle has the sigil. It can be claimed after the party gets the Golden Key to unlock the room he is secluded in.
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Cave to Rendarak • Dragon's Horns • The Dragonlord's Castle • Gwaelin's Gate • Hall of Hargon • Lake Cave • Lighthouse • Pillar of Winds • Quagmire Cave • Sea Cave • Tower of the Moon • Wellspring of the Hero
5 Sigils • Celestial skein • Echoing Flute • Eye of Rubiss • False idol • Golden key • Jailor's key • Moonshard • Ra's mirror • Ship • Silver key • Subtle shuttle • Sunken treasure • Teleportal • Floodgate key • Windbreaker • Yggdrasil leaf