Honestly, I think the Young Black Draqgon would be just as much a challenge for a Level 10 party as a Fire Giant would be, or very nearly so.
The Fire Giant can smash things, throws things, and hit hard. The dragon can do far more things at less power. Hover alone could turn the tide of a battle. A flying dragon could also cause a lot of damage.
Granted, though, my numbers SEEM far more accurate at higher levels than at lower levels, but then again, it has come to my attention that ALL CRs work that way. The ogre, which I modified to CR 3, is a perfect example. An ogre would probably wipe out a Level 1 party without difficulty. It could potentially defeat a Level 2 party. A Level 3 party would probably beat the ogre. A Level 4 party could smash an ogre to pieces effortlessly. Basically, CR at lower ranges means far more. That's why the numbers APPEAR to be inaccurate, when in actuality it's the variables that determine the vast array of power.
The Fire Giant can smash things, throws things, and hit hard. The dragon can do far more things at less power. Hover alone could turn the tide of a battle. A flying dragon could also cause a lot of damage.
Granted, though, my numbers SEEM far more accurate at higher levels than at lower levels, but then again, it has come to my attention that ALL CRs work that way. The ogre, which I modified to CR 3, is a perfect example. An ogre would probably wipe out a Level 1 party without difficulty. It could potentially defeat a Level 2 party. A Level 3 party would probably beat the ogre. A Level 4 party could smash an ogre to pieces effortlessly. Basically, CR at lower ranges means far more. That's why the numbers APPEAR to be inaccurate, when in actuality it's the variables that determine the vast array of power.