Dice and checks in Sword World 2.5 (2d6)

Everything in Sword World 2.5 rests on one simple engine: roll 2d6, add a modifier, and compare the total to a target number. Understand this and the rest of the rules fall into place. This guide unpacks the core check without reproducing any book text.

The basic check

When an outcome is uncertain, you make a check: roll two six-sided dice, add the relevant bonus, and compare against a difficulty set by the situation or the Game Master. Meet or beat it and you succeed. That is the whole loop — every attack, spell, skill and saving throw is a variation on it.

Why 2d6 matters

Two dice do not produce a flat spread. Totals cluster around 7, with extreme results (2 or 12) rare. The practical effect is huge: your bonus is doing most of the work, and the dice nudge you above or below it. A character trained for a task will clear routine difficulties almost every time, while a stretch goal stays genuinely risky. Compared with a flat d20, this makes competence feel dependable and keeps swingy luck to the margins — a design choice that colors the whole game, including combat.

Where your bonus comes from

Your modifier on a check is usually the sum of two things: an ability bonus and a relevant discipline level. Ability bonuses are derived from your six ability scores — the bonus is the score divided by six (rounded down). So a Dexterity of 18 gives a +3, added on top of whatever discipline governs the action. Higher discipline levels and higher abilities both push your reliable baseline up. Building those numbers is exactly what the planner visualizes.

Criticals and automatic results

Two dice results are special regardless of your bonus:

• Natural 12 (both dice showing 6) is a critical — an automatic success, and in many rolls it lets you roll again and add more, so big swings still happen.
• Natural 2 (double 1s) is an automatic failure, no matter how skilled you are.

This keeps tension alive: no task is a guaranteed lock, and no task is truly hopeless. The re-roll-on-max mechanic is why damage and power rolls can occasionally spike far above their average.

Opposed and fixed difficulties

Some checks are against a fixed number the GM sets (climb a wall, recall lore). Others are opposed: both sides roll and compare, such as your attack's accuracy against a defender's evasion. Either way the engine is identical — 2d6 plus bonus, high total wins.

Putting it together

Once the core check clicks, systems that look separate reveal themselves as the same thing wearing different hats: attacks, magic, skills and resistances are all 2d6 checks. That consistency is why Sword World is quick to learn. If you are just starting, pair this with how to play Sword World 2.5 and build a test character in the planner.

FAQ

What does 2d6 mean in Sword World 2.5?

It means you roll two six-sided dice and add them together, then add your bonus. Because two dice cluster around 7, your training and abilities matter more than raw luck.

What is a critical in Sword World 2.5?

Rolling a natural 12 (double sixes) is a critical: an automatic success that, on many rolls, lets you roll again and keep adding. It is how otherwise-average results occasionally spike very high.

How do I calculate my bonus on a check?

Add the relevant ability bonus (your ability score divided by six, rounded down) to the level of the discipline governing the action. The planner computes these for you.

Can a skilled character still fail?

Yes. A natural 2 (double ones) is always an automatic failure, and hard difficulties can outrun your bonus. But on routine tasks a trained character succeeds almost every time thanks to the 2d6 curve.