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I don't understand why Blizzard wants to create Nekarat and then completely made him irrelevant after you got the manual from him.
Just as someone suggested, Nekarat should have the chances to drop random key (act 1, 2, 3 key) when you beat him. At least people won't feel like gimped or robbed when they are farming at act 4.
Also, Act 4 mob density needed to increase further. Same goes to elite amounts.
Yup - it's a good idea. Andrew just added this! Should be in the next PTR patch