Great to hear, lar!
Well, hard to say. The spells I meant were some kind of "perma-death" spells. That means that you had to decide whether you want to reload the whole encounter (because saving wasn't allowed during combat) or you want to proceed with the respective character staying dead (of course if your main character was hit it was game over). Some people who are friends of perma-death mechanics and hardcore roleplay choose the latter but many others choose the former.
Example: an enemy basilisk casted "turn to stone" on a party member. Now there were two possiblities: either you have a "turn to flesh" spell or scroll available to bring him back to life or you don't. In the worst case some area damage hits the stone statue causing it to burst into pieces which was guaranteed perma-death with no chance to resurrect.
And the basilisk can use this spell multiple times a fight?
I'm not a fan of roguelikes and permadeath myself, but I'll set that aside. One of my concerns with that idea is how will it work in co-op?
"oops, the bad guy used a spell and now you are dead. Forever." It's no fun sitting there for an entire fight doing nothing because you don't have/ran out of/were the one carrying the very special and rare magic scrolls that were the only cure for that special status. (It's different than the more general Resurrect scrolls.)
D&D has a DM whose job it is to carefully guide events so that people are having fun. Sometimes that means fudging rolls, giving players little hints, or having critical items show up just when they're needed most. Computer games don't have that. I can't roll up a new Source Hunter mid-adventure and have him meet the party in the tavern. The systems are different and run in different ways, so you have be cautious what to borrow.
No, this is precisely not required. Skeleton archers are already vastly unbalanced for their levels. Their damage output, compared to their melee / mage companions is already far higher.
I agree - Skeleton archers don't need a buff, they're already extremely dangerous when there are two or more. Just visit the west cliffs if you don't believe me.