Not sure where your getting your information, but that is the role of druids, protectors of the forests. Note that druids are associated with a specific forest to protect which, in the case of Hartstone, is the Serenwilde. Kethuru's attack refers to the Divine Wars, not the Taint, by the way. The Taint is something relatively new and has forever changed Glomdoring and because of the enmity between White Hart and Crow, it would be a stretch to think Hartstone should feel obligated to protect Glomdoring.

Regarding the Taint, when it first entered the land, it WAS Kethuru. When Kethuru was driven back and re-sealed, the Taint lost its sentience and no longer affected life (i.e., mutating and/or turning beings into undead) as it did before. What the Taint had touched with Kethuru's presence, however, remained forever changed. (Thus, giving argument that Glomdoring isn't a pure forest worthy of protection as druids had felt to protect during Glinshari's time.)

Anyway, as protectors of forests, the only true forest left is Serenwilde.

Thanks for clearing that up for me.

Yeah, I know Kethuru was way before the unleash of the Taint, which is why I commented on them as different subjects. The histories are very complex, which isn't a bad thing.