Pfft, 100 orcs were a normal combat back in 2nd edition!
Normal or not, in any edition of D&D (and any game I can think of that isn't purely narrative) 100 orcs is an interminably boring combat. Any rule set that means you have to hit one more than once to kill it is even worse.
Yup. 100 orcs are a terrain or obstacle, not individual monsters that each have an XP award.As far as what CR they'd be: CR doesn't make sense for groups...
Normal or not, in any edition of D&D (and any game I can think of that isn't purely narrative) 100 orcs is an interminably boring combat. Any rule set that means you have to hit one more than once to kill it is even worse.
now, put the PCs in a monastery trying to stave off the horde long enough to get the monks to safety,or something similar, and you have a worthwhile scenario.
Yup. 100 orcs are a terrain or obstacle, not individual monsters that each have an XP award.
Really, 100 orcs is a TPK unless you're playing D&D or you're expecting Gandalf to arrive in the east.