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Message: <blockquote data-quote="Celebrim" data-source="post: 6223359" data-attributes="member: 4937">If a 16th level party encounters a CR 16 monster, we wouldn't expect it to necessarily represent a significant challenge.  By targeting the CR at the 'mid teens', my assumption was that he was aiming for the PC's to be no more than 13th level or so.  You can't expect a very epic fight when the CR of a monster is less than about 4 above the PC level.You can fill 16 10x10' areas with magma to the depth of 1' as the most generous interpretation.  Creative and a rules headache for a DM who must now decide how hot you can make something with a polymoph, how quickly it cools, how fast the air heats up, how much damage is the result of exposure, etc, and avoid the nonsense of trolling players that will want to claim that you should sink in magma like in the movies, but that's what, a 40'x40' area?   We can presume that the lair of a colossal creature has relatively more surface area, and for that matter if we assume the usual SRD rules for magma, the 2d6 damage it does per round of contact won't even noticeably harm a creature with fire resistance 10 prior to cooling to mere extreme heat.  I get your point, but I still don't agree that a monster with CR in the mid-teens must fly and/or teleport to earn it's CR.  I only agree that say a gargantuan Tyrannosaurus isn't necessarily a big challenge because its easy to obtain an absolute advantage over it.</blockquote>