example, hamedo is affected only with weapons, I wanted no way affect monsters?
would also be able to summon units into battle using abilities, such Ability (summon demon)
You can't do that. The only skill in the game that calls a "new" unit to the field is Morbol Virus which turns generics into Malboros. The sprite limit of 9 and the ENTD limit of 16 would make sure of that. The only way to call new units into battle is through events. You can get a bit creative. To my knowledge there may be a relatively unused piece of Battle Event coding that looks for a specific status to call an event other than just "Dead" or "Critical" but I could be completely wrong on that.