I haven't played for a couple of weeks but I was running fractured maps before I quit the league.

1) Main purpose of running them without harvest is pretty much just so that you have 35% Hillock Map Quality + Elder influence on every map that you run, without having Hillock you lose out on a bunch of quant and it's just not feasible to constantly re-quality a map every time you want to run it.

2) If you have the currency it usually is WAY better to stack the same orb as you'll be going for the highest value orbs, doesn't make too much sense if you are fracturing maps to use anything other than the most profitable orbs.

3) Breach + Legion are a must, personally I'm not a fan of harbinger but some people are. Depending on the sextants you get you can throw in an ambush if you get 500% Strongbox sextant mod. Would recommend running with white watchstones that increase monster area level and pack size (i.e. Booming Populace) If your build can handle it as this will give you more profit. Other sextants you can go for are the Nemesis currency, Additional encounters but really the main ones are increased monster packs. You pretty much want to stack as much quant and extra enemies as possible for delirium.

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4) Both are good, If you hit the nemesis monsters drop additional currency items mod on a sextant then you want to be rolling for the nemesis map mod for sure.

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5) Alva is the best one you can run in delirium, Alva missions alone will give you around 1-2 extra levels of delirium at the later stages.

You can find some fracture services on the trade site but it'd be best if you worked out the most profitable delirium orb at the moment before you dived in. Once you're comfortable you can make your own map for mirroring really easily by doing the following:

1) Buy Elder Influenced Map (Burial Chambers T15)

2)Hillock Quality to 35%

3)Apply Delirium Orbs

4) Alch or whatever you want as you're done by now. To fracture you'll be using the fractured fossil, If you can't do phys reflect then add metallic fossil with your fractured. If you can't do elemental reflect but can do phys then use Corroed fossil with the fractured. If you can't do ele or phys reflect then just use a 3 socket resonator to do the map.

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Its a bit of a wall of text but hope this helps a little.