Gotta catch'em all! Dungemon - Dungeon Monsters

Everything like Cairn, except:

Character creation: 

During character creation, whenever a PC would get a weapon, they get 2 dunge-balls instead. One of them contains their starter monster (max 1 at char creation). 1 dunge-ball takes up 1 slot.

Catching monsters:

You can catch a monster in a dunge-ball. Throw it against them after they received Critical Damage. The target has to be in range (around 40 ft, or one combat movement action). The monster in the ball will still be damaged.

You can't catch intelligent monsters. Dunge-balls don't work on the likes of bugbears, dwarves, elves, gnolls, gnomes, goblins, and orcs. Even though these monsters are able to fight, sometimes they use tamed monsters of their own.

Fighting:

PCs can't fight, they deal 0 damage even when using weapons. They can still cast spells.

A monster you caught will respond to simple commands. Shouting a command takes one combat action.

Letting multiple monsters out of their balls at once is possible. But remember, you can only shout 1 command each round.

Monsters can get Scars, just like PCs

Starters:

Fire Beetle: armor 1, 1 HP, 6 WIL, bite (d8), or flash

- The gland keeps casting light for 1-6 days after its death

- Can spend x HP to blind x targets for a round, rendering them unable to attack. Attacks against the target are enhanced

- If it receives 5+ damage in a single round, it gets flipped on its back and needs help to get back on its feet

Stirge: 6 HP, 6 WIL, bloodsucking peck (d6, Critical Damage: the stirge recovers as much HP as the STR damage dealt with its peck)

- A monstrous cross between a bird and a mosquito

- Its loud buzzing can attract enemies

- Does not come off until it has sucked all the blood, even at the risk of bursting. xin6 chance of bursting, where x is excess HP. Trying to get it to come off requires a Save (STR by force, WIL by command)

Spitting cobra: 2 HP, 6 WIL, bite (d6, Critical Damage: venom, see below) or spit

- Venom: instant death if 16+ was rolled on the Crit Damage save. Otherwise, the target is deprived, and unable to move until they receive an antidote

- Spit (melee range) causes blindness, permanent if not washed within 1h

- The design on the "wings" is different for each individual. Folks say that you can see the cause of your demise in the pattern (usually it's death by venom)