The dragon described above could also be immune to +1 or 2 weapons and lower. Or make the dragon completely invincible, unless you find a special rod, like the quest with all the beholders.
And timestop cant be negated. The description tells of everyone but you is frozen in a timebubble and you are in a non-timebubble *in* the timebubble. So the enemy would need a non-timebubble active at the same time of the start of the spell, otherwise its worthless.
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