in D&D Shillelagh allows a Wisdom Druid to still fight in combat but this game doesn't really have a pure Wisdom build so it doesn't matter
i took a look at the code and see Larian made a mistake... results depend on base weapon but i found a way to cheat with off hand weapons
first the base weapon with-out spell buff active
then the same weapon
with the spell buff
and last one is with a crit hit
there are other mistakes but the point is Larian says the spell should make a weapon that does D4... which is total bullshit because they 'assumed' a base club when they made the text and there are at least 3 other weapons that can be used with this spell