Have 3 Chest at the end of the boss fight. Add 1 key drop each successful encounter you run through (getting max score)
To make it fair so people don't botch other peoples runs, have the keys only usable for that run. Please upvote so mods can see this. 1 chest after one completion is too little for the effort especially for heroic. This is the reason the reckoning sucks (granted you can get the exact weapon and masterwork you want from menagerie) I hate doing more than 3 runs of the reckoning just for a chance to get a weapon and even then it won't happen. No one is going to want to run menagerie over and over for 1+ gear
Edit: Make one of those chest or the first chest a powerful drop while you're next trip gives you the second powerful drop
Please UPVOTE so mods can see.
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Biggest complaint during the first year of D2 was that good loot was way to easy to aquire and should require more grinding. Bungie ads an event that lets you pick the drop and base stats.. only randomness are the perks. 1 run takes less than 15 mins on normal. Yet thats just unacceptable? Huh? I see zero issues with the patch and it should allow the content to last longer. Cause at the rate players are getting drops they will be done in a week, crying that they have nothing to do. The reaction to the patch has been a bit ridiculous IMO.