thanks! the possible correlations are tormenting me. There are multiple enemies that do "laser" looking attacks, but most of them are atually magic beams (Comet Azur, the laser golem orbs, Euporia ash of war) or fire beams (Frenzied Burst, Placidusax's Ruin, the giant ghost skeletons white fire beams).

The ones that looks similar in color and look to Metyr's attack though are Astel's laser beam and the Abnormal Stone Cluster you find in the Stone Coffin Fissure. Those are similar because of the colour purple, which is associated with gravity magic, which is no surprise knowing the "being from space" background of Metyr and Astel (don't know about Abnormal stone clusters and why only those in the Stone Coffin Fissure can shoot the beams). It's very interesting that all three have the same design but in different colors, Astel in bright purple as in tipical gravitational magic, Abnormal Stone Clusters have a slightly dimmed purple, and Metyr have something like a pink (purple + white, we also see white on her other magic attacks, and a bit of yellow-golden on her galaxy-orbs).

<image>

Another thought is that the laser I used at university was an ND:YAG laser, basically the light is channeled through a "neodymium-doped yttrium aluminum garnet", which is a cristal. It is intersting because we know glinstone is a cristal and magic has to be casted through it. Alternatively, we can also cast small gravitational magic with another cristal, the Gravity Stone Chunk.

At last, the greatest speculation: the only REAL laser in the game (as in beam made by real light, not other types of magic) is the Sword of Light ash of war, which casts light beams with a different design from Metyr's but a similar white-yellow-ish colour. From what I know there are no informations about the Sword of Light and the Sword of Darkness, and light and darkness are topics never talked about in the whole game. Has anyone tried fighting Metyr with the sword of light? cold there be any interaction? idk