Dancer - 1 year after WotG

[Shadowhusky]

Since when do general monsters build resistance to Stun?

>Urat

[Ultimagi]

The update that added resistance building set a threshold. Every enemy added to the game thereafter would build resistance, but not to any degree that would be noticeable to any one person.
The resistance building was more noticeable on Notorious Monsters where you repeatedly cast the same spells, with several people. Notorious Monsters, however, received the resistance building effect even if they were in the game before the update.