I have a question: if magma defaces engravings shouldn't it smooth rock?
I think I'd go with the premise that magma on rock (given that it doesn't encroach on other tiles by burning through the rock,
en mass) 'worries' the surface, and where there's engravings it'll surround the fine features and burn/melt/abrade them away. But a rough rock surface (remains of digging out, or built of rough materials) is far more chunky and thus while it might do a
bit of surface alteration, will still retain a rough-hewn chunkiness, not surgically shave it down to the smoothed surface the Engraver would have produced.
Which is not to say there isn't a bit of inconsistency. A rough wall, when smoothed, has the roughness removed. The smoothed wall, when engraved, has some more wall removed (inbetween the carvings that are to remain), and yet magma re-smoothing it and it being engraved inumerable further times do not whittle the wall down to paper-thin, or break through it completely. (Imagine having to design and run fortresses while keeping an eye on such fine occurrences, though!)
It could be that magma passing around an engraved wall can be considered to 'fill in' the engravings instead. But let's just ascribe the same mass/volume non-conservation principles that mean the waste from a dug-out tunnel is but a minor impediment to free movement (if at all) while sitting in the void it previously occupied as virgin rock.
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Topic: Magma effect on floors/walls (Read 1065 times)