You know what, seeing 2 nature themed characters in the submission list has inspired me.
Spoiler: initial gnome warlock idea
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Posting interest as a Gnome 'Fey' Warlock.
Call of the Beast, Frightful Blast, Hideous Blow, Curse of Despair, Fey Heritage, Skin, Power.
Gnome con bonus plus DR means they can 'pretend' to be a frontliner, and small size helps with to hit. Doesn't go outside of initial sources.
Unfortunately a Melee build raises questions. I'll workshop it to see if I can make it go all right. Might just go different invocations/etc. Initial Thoughts are Human Fighter 2 for feats then Warlock.
I think it'd be hilarious if we had a all nature theme party, but I'm not going to push others to go for it.