Ignore and unaffected by

[feagaur]

Is Desper Leraux affected by a pyre marker when facing Sonnia Unmasked, if he moves over one or are unaffected and ignore different? 

[trikk]

What does “ignoring Terrain” mean? a) A model that ignores Terrain ignores and is unaffected by all of that terrain’s traits. If the Terrain is Impassable, the model may move through (but not end in) the terrain as though it weren’t there. Ignoring terrain does not allow a model to ignore the vertical distance of that terrain, so if the model wanted to move on top of terrain, it would still need to move that vertical distance using that terrain’s Climbable Trait.

So ignoring means unaffected by all terrain traits so if Desper moves through a Pyre Marker and Sonnia, Unmasked is alive, he suffers the effects of Hazardous

[solkan]

Just to be clear, @trikk's first paragraph is quoting the FAQ, question 8 and its answer in the Terrain section.

The bit in the rules that formally makes Sonnia's rule win over Desper's rule is the "Breaking the Rules" callout box (page 3 of the PDF), particularly the third paragraph of that callout box.