You seem to be under the incredibly mistaken conclusion that any "final boss" of an add-on or expansion has been the least bit challenging. Eald'narche was soloable at 75, Promathia was duoable(maybe even soloable, IDK), Alexander was trioable, and, while I've never fought Lilith, she looks like just as much of a joke. Technically speaking, Shinryu is a hell of a lot more difficult than any other if you're not using a brew.
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