When my 5 players go up to 8th level, they will be encountering their first dragon. I need help building an encounter that will feel tense without a TPK.
To create a deadly encounter using Kobold Fight Club, I determined this encounter:
1x Young Silver Dragon (CR 9)
3x Magma Mephit (CR 1/2)
But is a CR 9 too weak, and should I be looking at a higher CR? I know the DMG warns against using CRs higher than your average party level.
I know a lot can change based on terrain, but I just wanted to get a ball-park idea of what you all think.