Desmond comes zipping in but his acrobatics fails miserably against the dragon's combat defenses. The old creature effortlessly claws at the rogue, attack:1d20 + 24 ⇒ (15) + 24 = 39;damage:2d8 + 12 ⇒ (8, 2) + 12 = 22
I'm going to attempt to play Aragnak as a dragon should be played...bad*ss and cruelly cunning. He is not necessarily the stock dragon listed in monster manuals. He knows your group is powerful and he has planned for this encounter. The planning includes using items from its treasure horde and all of its most terrifying abilities. Hopefully this becomes a memorable encounter for everyone involved. Remember resurrection spells exist.