Author Topic: Balancing attack bonus and AC  (Read 2449 times)

Offline burbly

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Balancing attack bonus and AC
« on: June 17, 2014, 02:34:30 PM »
Hi all,

I'm trying to design a game which is similar to D&D in that trying to hit during combat involves

[Attack bonus depending on stats + items] + [dice roll] vs AC

I've been reading a lot of threads here and elsewhere to try to get the balancing right across a range of levels. Here are a couple of example problems: 
  • Fighters should be better at hitting things than thieves. But if the _gap_ between them gets bigger as they level up, then eventually either a) fighters will hit everything or b) thieves will find it v. hard or impossible to hit at all.
  • The game should be balanced so it is possible for parties without, say, a cleric to succeed.  But clerics have spells which boost attack bonus, and these get better with level.  So the difference in attack bonus between party-with-cleric and party-without-cleric becomes increasingly large with level...
My key design desideratum -- the reason I signed up to these boards to ask the q. -- is that I still want character optimisation to be possible and fun, and in particular I like the mixing of prestige classes. I want players to have the satisfaction of finding a really clever combination that will make their characters 30% more effective.  Just not 300% more effective.

I'll say a v. small amount about the game to give this some context. It's actually a card game akin to Pathfinder Adventure Card Game: Rise of the Runelords -- but mechanically closer to 3.5e D&D, e.g. in that it has separate to-hit and damage, enemy AC and HP, and so on, and in that certain cards represent feats and suchlike, as well as weapons and armor. Here are a few of the cards:



Colour represents class -- so e.g. red = fighter, yellow = cleric, purple = thief, blue = mage.  Mixing colours to create multiclass chars. is intended, and there will be 'dual colour' cards that support this, of course inc. prestige classes. E.g. 'Eldritch knight' would be a red/blue card that boost both fighting and magical capability.

The card game angle doesn't matter too much -- I think I'll be able to translate anything that would work for  RPG into those terms. So please -- any thoughts would be v. welcome.

The current balance situation I have is as follows:

All cards are divided into levels or 'Tiers', and as you get cards of higher tiers your to-hit goes up in three ways:
  • Better weapons are more likely to hit.
  • Better buffs give bigger bonuses to hit. 
  • "Leveling up:" Certain Skill cards like 'Swordsmanship' above make it cheaper to play attacks. (Cost is at top right of card, and is payed by sacrificing other cards of the right colour.) This lets you play attack cards with higher ABs, and the cost of attacks is calculated to make sure this that a cost discount of 1 always equals a +3 to hit.

Currently Enemy AC goes up by 4 per tier. Weapon to hit goes up by 2 per tier. Buffs to hit go up by 1 per tier and never stack. And the bonus due to "levelling" goes up by 1 per tier. This means that the % chance to hit is pretty much constant as PCs and enemies level.  Fighters start off a bit better than thieves at hitting, and stay a bit better.  In order to handle the party-without-cleric situation, fighters can self-cast to hit buffs like "Fury" after a certain "level" -- and these are always a bit weaker/more expensive/shorter duration than comparable level cleric buffs.

AFAICS this works, in that it can't be broken that easily. But it also seems somewhat dull, in that there isn't much scope for char. optimisation or other interesting things.  I want a system where clever tricks using multiclassing and multiple prestige classes can make your character, say, a bit better than a fighter at hitting things. 

thanks,
Mohan
« Last Edit: June 17, 2014, 02:39:36 PM by burbly »

Offline Madwand

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Re: Balancing attack bonus and AC
« Reply #1 on: June 17, 2014, 02:39:32 PM »
I don't have much to say about your card game, but if you want an example of a d20 system that is balanced and amenable to optimization in the way you suggest, I recommend Legend. It's free:

http://www.ruleofcool.com/get-the-game/

Good luck!

Offline X-Codes

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Re: Balancing attack bonus and AC
« Reply #2 on: June 17, 2014, 06:40:11 PM »
You're somewhat right that casters can supply buffs to Fighters, and concern that Fighters or Rogues without buffs would be too weak for level-appropriate encounters is not unfounded.  That said, most casters actually apply overlapping buffs, with few buffs being super exclusive.  Spells that supply odd bonuses to rolls give small bonuses, such as Prayer giving a +1 luck bonus or Haste giving a +1 dodge bonus.  On the other hand, Morale and Enhancement bonuses are very common and much larger by comparison.

A few other notes -- If you want optimization to be rewarding, then you can't have it be required.  That's the problem 4e had where you had to take every attack bonus and use attack-boosting powers on your Leaders to support damage-dealing attacks in order to have a reasonable chance of them landing, and even then just having your attacks land often could still lead to drawn-out fights.

Offline burbly

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Re: Balancing attack bonus and AC
« Reply #3 on: June 17, 2014, 07:25:05 PM »
Legend looks utterly fantastic -- thanks for pointing me at it.  To the extent that I'm surprised D&D hasn't just jumped on the same bandwagon.  I don't understand how they got the tracks to be balanced, though. There are a couple of blog posts discussing the design process, but no real detail.

One of the things I realised from looking at Legend was that I was trying to think in terms of mechanisms which make sense across arbitrarily many levels, and that this wasn't necessarily a good idea. If you know your system only works up to level 20 (say), then it's fine for the to-hit gap between fighters and thieves to expand a bit over that range, or for "odd bonuses to rolls [to] give small bonuses" which stack. Although I quite like the "nothing stacks" approach to bonuses because it's elegant in its simplicity. 

Quote
If you want optimization to be rewarding, then you can't have it be required. 

I'll bear that in mind -- thanks!

Offline sirpercival

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Re: Balancing attack bonus and AC
« Reply #4 on: June 18, 2014, 08:55:36 AM »
If you want to discuss Legend stuff, there's an IRC chatroom run by the Legend devs where they can answer any and all of your questions. It's #Legend on irc.gamesurge.net.
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