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Who's the toughest monster? Well, the Oliphaunt from Jandelay is challenge rating 30. He's sort of the tarrasque for mythic characters. By that I mean, the tarrasque was designed to be the most dangerous monster that normal, non-mythic 20th-level characters could take on. The Oliphaunt of Jandelay - a similarly gigantic, world-shattering monster - is probably about as tough as a party of 20th-level, tier 10 PCs can take.
&%*^ I just looked at the Oliphaunts stats
That thing makes a tarrasque look puny