Re: Druid main character forgot title

I read a novel 2 years ago and the main character was a druid or dryad. He starts out in the forest but eventually joins an adventurers guild. There is this pixie that really likes him cause he feels like the forest. I also believe at one point he poisoned a hydra with cyanide. If this ring any bells please get me the title or point me to a website that has it. Also mc evolves to more powerful druid or dryad over time.                                                                                                                                                                                                                         
 Not daily life of a mushroom