Felajm Shamans are backbone of the Felajm culture. Theirs Shamans are basically priests of their Swamp Dragon.
The Felajm society is built on worship of their dragon ancestors. It is possible that this worship caused the conflict between them and Gobnar in the first place. Felajm always believed that they were created in the image of the Swamp Dragon. Gobnar obviously differed from this perfect dragon image. Over time, Gobnar became fine with being dissociated from the Swamp Dragon. That however only divided the races even further.

Felajm Shamans can create magical fireballs that can decimate entire armies. Their powers come from the spirits of the Swamp.
Gobnar also have their own Shamans, but those are completely different. Gobnar Shamans are basically Warlocks as they wield dark magic and rely on cursing their opponents.