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group combat is strange - if there are three same type monsters with DR7 they would be one with DR10 (DR7 +3). So when I roll 9 I would get 1 harm. If they are different species when I roll 9 every one of them would get 2 harm and I just need to roll over 5 next time. So If they are the same they are much harder to kill.
Yes, that is the point. The group of the same type of enemies is usually deadlier due to knowing their own strength and can coordinate smoothly. It forces you to make a quick backup plan when too many enemies appear.
Just like a single wolf and a single lion, you can kill a wolf first easily, but if it's a wolf pack, then it's a whole different story.
Also with RC, you can gain a benefit when using the environment. For example, lure 3 of them to a narrow place which they have to go inside in a column one by one, this way they will lost the +3 bonus, and you can elimite them easier, (maybe I should mention this in the RC rule.)
It seems quite interesting and may lead to some extremely difficult situations. Let's continue with your example. After killing the frog, then the player needs to roll a 17 in order to kill the wolf? If you follow this rule, it is just impossible to kill a lion unless you kill a frog and a wolf first.
Feel like you must scatter layer to layer in order to kill the core which is very cool and exactly what I want. This rule will require you to use the RC rule as much as you can in order to deal with the group of enemies or you may want to flee because the enemy is too powerful.
Sum up:
Group A
The DS of this group will calculate like this:
Keep the highest DS, the lower will count as 1
Highest DS + 1 + 1
The DS of group A will be 9+1+1=11
From now on, you can freely kill that lion.
I would't make it that hard.
Group A
The DS of this group will calculate like this:
Keep the highest DS, the lower will count as 1
Highest DS + 1 + 1
The DS of group A will be 9+1+1=11
it makes it harder to fight the group, because they get +1 for every additional member but it's still fast, because you only got one roll against all of the enemies.
In Advanced Dungeon Goons it works similar but you still got to fight against every enemy separatelly, so you they get +1 modifier to DS for every adittional group member, but you roll against every one. In our case:
Lion DS 9 + 2 = 11
Wolf DS 7 + 2 = 9
Frog DS 2 + 2 = 4
And you roll against a frog, you roll 6 and you kill it. Now you roll against a wolf that is 7 + 1 (because the frog is killed now), and so on.