This source modification is requested by Judas. If this mode is enabled, homunculus will not receive any damage from Player, Pet, Homunculus, or Monster. This is can be set on battle config file. This works like when player using @monsterignore.
Also, when CandyCandy asked to improvement, so homunculus only ignores damage on certain map. So, if the map only for PVP maps, homunculus can be attacked at outside PVP maps.
Here the screen shots. 😀