I'm walking around an area with some destroyed houses on the way to the fire giant. I have found the shape like the letter X, but I can't find the R. It seems to light up around the roof of the house but I can't seem to find the location of this letter to unlock the door.
Head up to the balcony on the building to the right. You will see that the R letters are floating around. If you look down in the ground you will see there is a line of fire in the shape of an R. Thought this one was a bit shitty. Took ages to find and was not satisfying when you discover it's actually written in the sand rather than being part if the enviornenvi like all others are.
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