How does Advancement really work?

[Archer]

This is the sort of creature that kills someone and then dies. It has far more offense than it has defense. It deals around 22 damage with its bite which would rarely miss and trips almost automatically. It's a buff hill giant which is CR 7 so this must be CR 10.

2 of these would take down an 8th level party or at least severly challenge it. The fighters would always be standing up from prone as their move action. With power attack as their feat, a pair of them would kill a player each round. +4 to hit for prone +2 for flank +1d6 damage on each of 3 attacks, use about 5 pts of power attack for an extra 15 damage per round. All 3 attacks will probably hit. Damage total looks like: 1d8+5d6+45 per super-worg. With surprise and initiative, a pair of these will wipe an 8th level party 99.9% of the time. If the party got surprise and initiative I'd give the party a 50-50 shot of not losing someone and only a 10% chance of getting wiped.

 

[Celebrim]

"It's a buff hill giant which is CR 7 so this must be CR 10."

Well, I think CR 10 is abit rough myself. That implies that one of these can take down 2 hill giants or provide a suitable challenge to a party of 10ths. I don't buy that.

I'm not saying the hill giant is tougher, but the hill giant has several advantages on the Half-Infernal Worg.

a) The hill giant has a pretty brutal ranged attack: +8/+3 ranged (2d6+7). The worg is fairly helpless when ranged (say by a flying sorcerer).

b) The hill giant has reach, meaning that it gets an attack of oppurtunity if you attempt to close with it.

c) The hill giant has about 20 more hit points.

And as a CR 8 creature, of course two of them have a good chance of killing at least one member of an 8th level party.

 

[(Psi)SeveredHead]

The Barkskin won't help, since it already has natural armor.