EVENT GiveStatusArs
ON
OnCharacterStatus(__Me,Wet)
ACTIONS
AddStatusInfluence(__Me,SLOWED,20)
Do you have WET or Wet in your script? It must be: OnCharacterStatus(__Me,WET) like you wrote above.
I'll try the CHILLED status later. Some things with status effects don't work: removing FROZEN or KNOCKED_DOWN via script, for example. Maybe it's a programming thing here, too.