Here are a few examples of various monsters and minions I have written up for Old School Hack.
1. Basic Goblin Minion (minions are 1 hit point creatures in OSH. They only roll 1 die to hit, so it usually takes more than one to combine their attacks to get a hit on a character). AC 8-10. HP 1.
o Run Away! Add up HP of monsters. If equal or less than the number of party members the goblins automatically slip away. Add them to the next encounter.
o They try to gang up with at least 2-3 per opponent.
o Hatred of dwarves. If they have to choose targets dwarves will be the priority.
2. Hobgoblin Fighter (Guard level, which means they have 2 HP and roll 2 die for attacks. They will give characters a bit more trouble). AC 8-10. HP 2.
o All out attack. They can roll an extra D10 to hit, taking the top 2 die, but are then eliminated.
o Hatred of elves. If they have to choose targets elves will be the priority.
3. Bandersnatch (Monster, larger or tougher creatures that can give a character a tough time one on one). AC 12. HP 1D4+2. Reach weapon. Frumious.
o Fuming (Savage). 3 AP. Once per Combat. If it scores any hits double the damage.
o Furious (Fast). Constant. +2 on Initiative test and can move 2 arenas or move 1 and act in each round.
4. Kobold Shaman (Boss level creatures, usually have minions and guards along with them, additional skills, and tougher overall; well, kobolds might not be the best example of the latter!). AC8. HP 1D4+2. Light weapon, 1 hit.
o Dark Gods. 2 AP. Focus. The creature summons the dark energies of the gods it worships. After a frenzied chant dark orbs surround the target.
Attack: Ranged; Hit: 1 damage.
Effect: The target takes a -2 penalty to all attacks on their next turn.