La Luz: The Burning Heart of the Sea of Wrecks

This is a real place is Spain (minus the blue light)

(La Luz lies at the center of the Sea of Wrecks, a rocky and broken seascape, a vast ship graveyard, dominated by ravaged ships, jagged rocks, and marine detritus.)

La Luz looks like no other lighthouse in any other sea. Dozens of angular columns, each made of pale white stone and of unequal and increasing heights rise out a central triangular base. The columns culminate in a final square pillar reaching just above 150 meters in the air. While at sea, no matter what direction you face the apex column always seems to face towards you. While on the small island where the lighthouse sits, the apex column always appears to be facing away from you.
The oldest reliable records of La Luz are almost 800 years old, reported by some of the earliest Gray Sea sailors. Their description of the tower matches nearly word for word how it looks today. The stone that the lighthouse is made of appears to be immune to the pitting and weathering that plagues other structures located by the salt water. The tower stands in stark contrast above the rotting and rusted hulks below.

The tower emits an incredibly bright blue light that is painful to look directly at. This light can be seen from any given point in the Sea of Wrecks at any given time. The light itself appears to have some sort of hypnotic effect, sailors that stare too long into it become mesmerized and absentminded, steering their boats towards the light like moths to a fire. It is difficult to break a sailor out of the spell of the azure light of La Luz. It seems only the violence of a hull smashing into rocks seems to break the trance.

Strange still is the source of the light. No fire burns at the apex, nor is there any sort of spell or magical sources. The only thing at the top of the tower is a large mirror set at a 45 degree angle and a large focusing lens. The light of La Luz comes not from the top, but from the bottom.
A great pillar of blue light issues forth from the center of La Luz. Entering the lighthouse, even during day, is like emerging from a dark room into the bright sun. Even with eye protection it would take you a moment for your eyes to adjust to the light. A great triangular staircase goes both up and down the tower. Climbing up the tower the light gets less intense and at the top eye protection that would be required on the ground floor is no longer needed.

Climbing down, the light is brighter the farther down one goes. After a few meters most eye protection is useless and one needs to close their eyes or else be blinded by the light. Many of those who have attempted to delve the depths of La Luz beyond this point have carved instructions, warnings, and their own names into the stone.

KILLROY WAS HERE

A few more meters and any exposed skin will begin to tan turning quickly to sunburn. Farther still and closed eyes no longer keep out the light, it has become bring enough to blind through eyelids. Special fully enclosed helmets are necessary to make any further progress without suffer permanent eye loss.

Going much further than this requires a full reflective suit as it has become so bright that anything capable of absorbing light will burn. No one has been able to make it to the bottom of La Luz. Even the most reflective of suits fail after a point and no magic spell or alchemist’s potion seems to halt the burning of the light.

The light of La Luz can be harvested. Past the point where a protective suit is required special mirrored jars and boxes know as Jarred Suns are filled with captures of the light. These Jarred Suns are particularly prized by hunters of the undead and by adventures alike. If opened a Jarred Sun will issue forth bright blue light, much like that of La Luz, but unfocused. The light is comparable to a torch, but has the benefit of required no fuel, issuing no smoke, and being able to used where a normal fire would be unable to be made. Destroying a Jarred Sun creates a burst of light, the issuance of which is like that of a thousand noons, which besides blinding most will severely harm most light sensitive creatures, if not outright annihilate.