This is the code for the Spawn monsters and variants in the second mission pack "Dissolution of Eternity"

TARBABY.QC

/*QUAKED monster_tarbaby (1 0 0) (-16 -16 -24) (16 16 24) Ambush Blue Green Spots
The Spawn (and hellspawn)

The spawn type is random by default.
If you want a specific type, select "Blue", "Green", or "Spots".
*/
void() monster_tarbaby =
{
    local float     myRand;
    local float     skillLevel;

	if (deathmatch)
	{
		remove(self);
		return;
	}
	precache_model2 ("progs/tarbaby.mdl");

	precache_sound2 ("blob/death1.wav");
	precache_sound2 ("blob/hit1.wav");
	precache_sound2 ("blob/land1.wav");
	precache_sound2 ("blob/sight1.wav");
	precache_sound2 ("blob/mytosis.wav");

	self.solid = SOLID_SLIDEBOX;
	self.movetype = MOVETYPE_STEP;

	setmodel (self, "progs/tarbaby.mdl");

	setsize (self, '-16 -16 -24', '16 16 40');
	self.health = 80;

	self.th_stand = tbaby_stand1;
	self.th_walk = tbaby_walk1;
	self.th_run = tbaby_run1;
	self.th_missile = tbaby_jump1;
	self.th_melee = tbaby_jump1;
	self.th_die = tbaby_die1;

	if (self.spawnflags & 8)
	{
		self.th_pain = tbaby_mitosis;
		self.skin = 2;
		self.health = 100;
	}
	else if (self.spawnflags & 4)
	{
		self.th_pain = tbaby_mitosis;
		self.skin = 1;
		self.health = 60;
	}
	else if (self.spawnflags & 2)
	{
		self.skin = 0;
	}
	else
	{
        skillLevel = cvar ( "skill" );
        myRand = skillLevel * 0.2;
        myRand = myRand + random();
	
        if (myRand > 0.8 && skillLevel > 1)
		{
			self.th_pain = tbaby_mitosis;
			self.skin = 2;
			self.health = 100;
		}
		else if (myRand > 0.5)
		{
			self.th_pain = tbaby_mitosis;
			self.skin = 1;
			self.health = 60;
		}
		else
		{
			self.skin = 0;
		}
	}

	walkmonster_start ();
};