Aerthalas

The Tidemarked Door is a colossal circular stone door, intricately carved with ancient runes that shimmer faintly in the light. It is only visible during the lowest tide, revealing a hidden entrance to the inner sanctum, rumored to contain forgotten relics of storm magic, waiting to be uncovered by those brave enough to seek them.

The door is adorned with swirling patterns that resemble crashing waves and lightning bolts, giving it an otherworldly aura. The stone is weathered yet sturdy, with a deep blue hue that reflects the ocean's depths.