EDIT: The fastest way currently to do this is get Treasure Chest and re log.*T.O. Morrow is fastest, but needs
Batman mentor. Just go in, get Chest behind bookshelf, and re log.
Will make you start outside of instance. Rinse and repeat.
*Intergang Penthouse is another fast place, with no special mentor needed.
I'll leave this part below, as it's still good when queueing for pvp, alerts etc.
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A fairly quick way getting the feats. Needs grinding. But 100 a day can be done, no doubt.
Feats: 5x 10x 25x 50x 100x 250x 500x 1000x
All the low level instances/dungeons have treasure chests in them. However, these 2 are short and
don't have multiple spawn locations for the chests. They're always at the same place.
There is no need to kill all in the instance or do the side mission. But it is very important to complete it.
Don't turn around, go back and leave. Won't reset then. You're doing 2 different instances so the other
can reset.
GothamIntergang PenthouseTreasure Chest is located under the stairs.
Distribution CenterTreasure Chest is located in a room on the left side, after completing two sets of stairs.
You also have the Temple of Crime instance, that is closer to the Intergang Penthouse instance.
It's fairly short but the Treasure Chest spawn at 3 different locations. On the plus side you're able
to get Batwoman´s Serrated Cape as loot. Goes for around 20.000-60.000 in the Auction house.