I am not sure how easy it would be to implement this, but after reading the description of the spell 'Brambles' (Druid lv2), it came to my mind that there is one weapon that could be added to the list: level 12 druid Plant Shape: Treant/Shambling Mound slam attack.
Technically the slam of the high-level druid form is indeed wooden weapon and would fit the description, but would require Natural Spell feat and high level, nearly single-class druid to make it more balanced.
Technically the slam of the high-level druid form is indeed wooden weapon and would fit the description, but would require Natural Spell feat and high level, nearly single-class druid to make it more balanced.
