Combining your Rewards
Many of the microtransactions in this Mystery Box can be combined. For example, if you receive both the Overseer and Scavenger Body Armours from their respective armour sets, you can combine these to receive the blended Midnight Pact Body Armour.
To combine your microtransactions, press "N" to visit your microtransaction stash, find the item you want to combine and click the small gold symbol in the top right of the icon. This will take you to the combining screen shown below.
Please note that this is a permanent process and they cannot be separated once combined. If the microtransaction you're looking at doesn't have the gold symbol this means you either need to acquire the other half of the pair or it's not possible to combine it with another microtransaction.
The microtransactions that can be combined are the Armour Set Pieces, Cloaks, Wings, Portals, Hoods, Footprints and Weapon Effects.
These microtransactions will also be available in the store approximately one month after the Expedition League ends. You'll still be able to get them by combining Overseer and Scavenger microtransactions or through direct purchase. Their purchase price will be twice the original microtransaction. For example, the blended Midnight Pact Footprints will cost 160 points which is the equivalent of purchasing the individual Overseer and Scavenger Footprints for 80 points each.
Check out this ensemble using most of the blended microtransactions below!
How to open your Mystery Boxes
After purchasing some Midnight Pact Mystery Boxes, you can find them in the Consumable section of your microtransaction stash in-game waiting to be unwrapped.
Note that these Mystery Boxes have random outcomes. Some items are rarer than others (as listed above). You are guaranteed to get an item that is worth at least what you paid for it (30 points) and it's statistically more likely that you'll receive something of higher value.
Outside of microtransaction value, there are no guaranteed outcomes. Duplicate items are possible.
Many thanks to everyone who has purchased a Mystery Box at any point in time. They've become a huge driving force in our ability to continue to create frequent updates like Path of Exile: Expedition! Thank you so much for your continued support.
Update: Corrected the post to correctly say that the items that can be combined are Armour Set Pieces, Cloaks, Wings, Portals, Hoods, Footprints and Weapon Effects.