Dark Dragon
Explorer
Round 1: Haste, AMF, charge casters
Round 2: Grab/Snatch caster, fly to volcano
Round 3: Dive into lava
Round 4: Dive half a round, release caster, go up again
Round 5: Go to 2.
This looks in parts quite similar to my first idea, and would result in a TPK, more or less. AMF + dragon is a nasty combination. Haste would be suppressed in the AMF.
Lava does 20d6 fire damage, but the caster could survive for about 2 or 3 rounds (she has some 150 hp), sufficient time to try and cast Dimension Door and/or Protection from Fire. Ok, for this, she needs to make a Concentration check against ongoing damage with a DC close to 50... very difficult but possible to make (she maxed it out and has a good CON).
Immersing a creature in lava is difficult due to its relatively high density (unless the lava is natrocarbonatite

One point NOT to use a cozy lava bath is that the equipment wil melt away as well, and the dragon would not gain any items.
My intention is not kill the party, but to put up a challenge that fits the scenario and shows the PCs that their life is in serious danger, despite of facing a "minor" foe... That is why I hesitate to use AMF in the first instance.
Maybe the dragon casts it in round 2 or 3 (after pelting the party with other spells), this should alert the PCs that they are in serious trouble. The players know that the big dragons often use the fly-by and snatch attack routine, and if that is combined with AMF...
EDIT: Wow, many replies while I was typing...
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