There would be a few different stages of a prop monster 1st being the core stage where the core or the brain of the monster has to go wandering around and finding and collecting props of any kind to try and build themself a body that has to kill everyone on the map. 2nd stage would be a incomplete stage of the final form where he has very few props which are used to try to protect the core (If the core takes enough damage it will explode and the collected props will shoot away from the core as it makes a small explosion) then for the 3rd stage he could be in the "Perfection mode" where he has taken a shape of a humanoid figure and will still collect props that are deemed "Good armour to protect the core" and is on a task to kill everything on the map and his arsenal of weaponry could include guns, lasers, propkilling and if you want you can make it compatible with hbombs and if it picks up a bomb it will use that as a weapon to unleash on the players. and for his final stage that resembles a rocket with 1 super laser and when the inner core is super damaged it will start to transform into a rocket and fly up to the sky limit and turn around and start to charge the super laser and when its fully charged it will fire and atomize EVERYTHING on the map including props, players, npc's, (depending on the damage u set the final blast to) and have the laser fire for about only like 10-20 seconds. and also if you can try to make another stage if the map has very little props make the core and its collected props turn into a sort of worm type thing and it goes underground and pops up and kills someone. also add a mesh so if someone's on a city map it can manipulate props into making different shapes to fit the circumstance. also if you want make it have a chance to spawn in little prop monsters that can go through small doors and such. also sorry for the long request make it so if the thing explodes if you can add different voices for his different stages, if he dies in the 1st stage he says something like "NOOO I COULD'NT EVEN GO INTO MY 2ND STAGE" and if it dies in the 2nd stage it will say "NOOOO" but if it dies in the 3rd stage or the rocket stage it would say "THIs ISN'T THE LAST YOULL SEE OF ME!!!!!" So please if youre seeing this please make this a reality i bet a lot of people will download this addon. also make the core pretty hard for normal npc's with guns to hit the core same with players me and my friends love a challenge so please and thank you if you make this npc real.
sorry if this is too wordy also i was thinking of this.