LogFAQs > #955350433

it's a lot of separate stuff

Curse of the Vampire adds Gauntlet Mode, which are challenges made up of multiple stages (eg. the first one recommended level 5 has Defeat 100 Enemies, then goes into a Defeat Nebula stage, then a Defeat 40 [strong] Enemies one). There are seemingly 14 gauntlets, building up to level 100.

After the first clear of a challenge, when you replay these challenges they loop indefinitely until you die or just opt to retire.

CotV also adds Nightmare Mode, which is just a new even stronger difficulty mode (greater than Superior and Ultimate) of the main story adding in the concept of Cursed/Infected/Reborn enemies.

It also adds the SHIELD Depot, a shop for buy character voiced lines, exp stuff and ISOs for a token currency one from the DLC challenges, Best bit is offering an unlimited stock of EXP cubes for the cost of gold tho!

As for unlocking the characters, that's through Gauntlet's first 5 challenges of variable recommended levels (Punisher 10, Blade 20, Moon Knight 25, Morbius 30)

at this point I should mention I beat main story Mighty difficulty at around level 45-50 I think?

Rise of the Phoenix

This one adds some more Gauntlets, bunch more SHIELD Depot costume rewards, and the new feature Danger Room. Danger Room is like a competitive mode you race against your opponent party against a set of rift-style challenges. Along the way completing sub-tasks to sabotage your opponent's team (like inflicting confusion status). You can play Danger Room against player or AI teams, so still single-player friendly. Base recommended Danger Level challenges are level 20.

New characters are again obtained through Gauntlet, this time at higher levels (although still the first Gauntlets of the pack). Ice Man 25, Gambit 30, Cable 35, Jean Grey 40.

Shadow of Doom

A few more Gauntlets... this time ranging from levels 90 to 170. New Danger Rooms, and again of course new costumes.

However this time you unlock the new characters through the added Epilogue story mode. After the first stage which is a partial retread of Wakanda you meet the Fantastic Four at I think level 40 or 45, one or the other. From this point I actually just did the rest of the story using them as my party for it, so I guess if you can get through Wakanda you can get through the epilogue and unlock Doom (although the final boss I absolutely had to abuse XP Cubes to level up and restore HP/EP). The final final character as I mentioned is gonna be clearing the epilogue on Ultimate Difficulty.

Free DLCs

Cyclops/Colossus are under the Rifts, I believe level 20-something challenges available right away.

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