This is a simple combat system I just thought up. It might come in handy for 5ym, or for another game later.

It's based on the combat system for Dungeon:

Dungeon combat:

Every monster has between 1 and 5 dice (d6), and one hit point.

The player starts with 2d6 and 5 hit points.

Every round, you can either leave, or attack again.

For an attack, roll all the dice, and compare the highest two dice.

If the monster's is higher, then the player loses an HP.

If the player's is higher, the monster dies.

If they're the same, nothing happens.

My combat:

Every monster has some number of dice for attack, and some for defense.

Every player has attack and defense as well.

These dice can be any collection of dice, like 2d6+1d8, or 5d1.

Both players and monsters have multiple HP now, too.

Every attack, roll all the dice, and compare them like this:

Monster's highest attack versus player's highest defense

Player's highest attack versus monster's highest defense

If someone gets hit, they lose a hit point.

Note that it's now possible for the two sides to hit each other.

We also introduce the concept of critical hits.

If a hit is made by rolling the highest value on the hitting die, it's a critical hit.

Critical hits, besides doing damage, also remove the smallest (by number of sides) defense die.

Spells:

We can also add spells into the combat system easily. Here are some examples:

Magic shield: add 1d20 to your defense for the next round of combat.

Mini magic shield: add +1 to all your defense dice for the next round of combat.

Speed attack: compare your top two dice against the opponent.

This one needs a little explanation. It would attack twice on the same roll, so if you rolled 4 4 5 3 and it rolled 2 4 3, you would hit twice: 5 vs. 4 and then 4 vs. 3.

But, if it's 4 4 5 3 against 2 4 4, you would still only get one hit: 5 vs. 4, then 4 vs. 4 (bounce).