There are a bunch of Fyreslayer stories. Arguably, no dedicated Fyreslayer novels, but:
*Legends of the Age of Sigmar: Fyreslayers, which is a compliation of short stories and a novella.
*Bonereapers, a novella which while the Bonereapers themselves get top billing the Fyreslayers are the main heroes opposing them.
*Heirs of Grimnir, an audio drama spinoff of Realmslayer that focuses purely on Fyreslayers.
*Grombrindal: Chronicles of the Wanderer, which is evenly divided between Dispossessed, Fyreslayers and Kharadron with neither really getting more focus than the others.
*Soulslayer, a Gotrek novel which is something like 70% Fyreslayer focused.