In the earliest iterations of TNP, the idea was that monsters would always do a flat amount of damage (usually 1 point) when they targeted the PCs. This was partly because HP was a lot lower (essentially capped at "maximum value of your class die") but was also done to speed up gameplay; it was one less roll the GM needed to make. When I decided to expand the monster roster to include minion types (and swarms) this idea of fixed damage was integrated into their designs, and other monsters were given a damage roll, often referred to as the "monster roll" -- specifically a d10 and a d6.
(Without going on too much of a derail, this was derived from my own hack of the "MM3 on a business card"-math that came out of 4th Edition D&D; essentially, I used 1d6+1d10 (per tier) as the monster's damage roll.)
In 4e, the ethos is "attacker always rolls" i.e. you don't roll a Reflex save when targeted, instead the attacker rolls vs. your Reflex defense to determine whether their attack succeeds. TNP kind of... does an homage to this, by saying "players always roll," which means you roll if you're attacking OR if you're being attacked. This was an interesting quality-of-life improvement on the DM side, particularly in the play-by-post playtest games I've done; the DM could declare the monsters as targeting certain PCs, and say, "roll defense; take X damage on a fail," and the play could move on to the next person in initiative. Eventually the roll made when a player was attacked got renamed from a "Defense roll" to the more familiar "saving throw."
Where this tends to get gummed up is in status effects and conditions. For example, if an effect gives you disadvantage on attack rolls and saving throws (such as the Incapacitated condition) how does that work for monsters, who don't make either? Well, the short explanation is that while the monster roll funcions as the damage roll (on a failed saving throw) it is treated as also being the monster's "attack roll" for the purposes of applying such penalties; the disadvantage is applied to the d10, thus making the monster roll effectively a "percentile" die roll which models advantage/disadvantage, and with a d6 added to it.
(Worth mentioning here is that this is also how skill checks are handled, as they use the exact same dice. In the new draft I have been working on, skill checks are therefore recommended to always be rolled as percentile dice with a d6 bonus die, rather than "1d10+1d6" -- but more on that in a future post, probably.)
Alright, so what about the disadvantage on saving throws? Well, the Incapacitated condition (which gets nested into lots of other debilities) also causes anyone with this condition to grant combat mastery to their enemies. Now, this is where I need to have a big think: Should the condition expressly say, "monsters are impacted in X way, but PCs are impacted in Y way," or, should this condition cause PCs to both have disadvantage on saving throws and grant combat mastery, while monsters only do the latter? This seems overly-punishing in a way that isn't really intended, so I'm thinking some of these conditions might have to stipulate different effects for monsters or players.
The same issue arises with things like positioning or terrain effects; since "advantage on saving throws" has been excised from the mechanics, these effects instead grant the PCs a save bonus (a d6, which can be stacked, but only the highest d6 roll is kept.) But what about the monsters? Well, they don't make saving throws, so instead the PCs should have disadvantage to attack enemies with one or more of these effects in play... Which then begs the question: Instead of a save bonus to the PCs, should cover (or similar) instead grant disadvantage on the monster's "attack" roll, just so that the terminology being used is consistent (even though the mechanical applications are different)?
I do think that the way in which conditions and status effects were built out in 4e was slick, and very much worth emulating. I'm just having a bit of trouble translating that ethos over to a system with a different mechanical underpinning. This is one of the other reasons that I'm becoming more convinced I'll want to take on the task of doing a followup game to TNP. I think the game could be made to run a lot smoother with some different mechanical underpinnings, such as "attacker always rolls" and using things like flat modifiers in some places (instead of dice, for everything) -- but then it wouldn't be TNP anymore; it'd necessarily have to be something different.
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Next post is planned for April 4th so check back then!