Alumen. Black Alumen. Mining if I remember.
And 3 skins for 1 leather is harsh.
Add that to Coerthan Tea Leaves gated botanist gathering, and well...I won't be melding my post-50 LTW gear anytime soon.
(*Just* found out after looking for hours that Coerthan Tea Leaves were rare node, stuff that I don't usually do on BTN as I'm not hardcore...)