The Grand Tapestry

(c) Copyright 2009 Kyrinn S. Eis all rights reserved

Everything boils down to Percentile, or a clever die-mechanic for its own sake.
Combat on 1d20 was an afterthought, but it 'stuck', and contemporary games like Swordsmen & Spellslingers' reversion to 2d6, or Tunnels & Trolls' continued use of the 2d6 Saving Roll, illustrate that a tight bell-curve works fine, so long as the limitations of the curve and its havoc on Percentages is taken into account.

In my attempt to remain faithful to the Old School, I occasionally argue with myself regarding the best die-mechanic to employ for a given situation. In general, I emulate existing principles, if only for generic applicability, such as the ubiquitous 1d6 for Ambush, Detecting Architectural Features, Surprise, and Trap-springing.

But, knowing that a '1 or 2 on d6' is really a 33% makes me occasionally want to wander from the simple homage, toward something more akin to ICE's Rolemaster. And then I stop myself.
But, why is potentially deadly combat better on a d20 with its chunky 5% blocks, when less critical 'Thieving Skills' are more precise with their d%?
Why!?

Tradition, and Portability.

If my game is to be Old School from a mechanics PoV; if it is to be generically compatible with OD&D, S&W, or BFRPG; it 'ought' to follow Tradition for Portability's-sake. Right?
Picking up a neo-Old School adventure module and running it in UWoM is greatly facilitated by having standardised mechanics (although, yes, OS is all about self-reliant and adaptable GMs/Refs), but more importantly, a Labyrinth Lord (etc.) ought to be able to pick up an UWoM adventure or supplement and have minimal conversion work -- if only out of professional courtesy.

So, what's a girl to do, but stick with Tradition?
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* UWoM's combat isn't based upon an Armour Penetration 'to hit', but a more Palladiumesque 'physical connect' premise, and this reflects in a lower base number to be scored on the d20, although Str still figures in a modifier for brute attacks, while Dex figures for 'finesseable' attacks and ranged. Once a hit is determined, damage is rolled, and the Armour die is subtracted from the result before Dodge Points are deducted from the target.

* Con still figures into Dodge Points, but (Constitution score + Str mod.) is the terminal Threshold for actual damage, not simply 0 or -10.

* Percentile rolls are made as 'higher is better', rather than 'roll-under', with 100 as the target number, because, psychologically, higher seems better/cooler, and generating a 128 on a Pick Locks just seems to tell me as a Referee that you did it a lot faster than the cat who rolled a 101. Likewise, Binding Wounds are made on d%, and modifies how much damage is actually treated.

That leaves us with the quirky n in d6 rolls, of which I'm of the opinion that 'higher is better' should apply to as well. But, do these rolls on d6 make sense?
I'm this close to switching them out for d%.

Thoughts?