Nightmare Reaperis a high damage, high mobility close range based play class with a unique resource called Heat that manages its spell-like abilities. A Nightmare Reaper has limited options at range and is more comfortable creating havoc in close quarters.
A Nightmare Reaper's damage potential is high if it manages its heat supply effectively. Often, especially in early levels, a Nightmare Reaper without access to good heat gain is in trouble without help from party members. A Nightmare Reaper has little protection against ranged attacks such as arrows and can be knocked down without being able to charge any heat to fight and has no healing spells or abilities.
Clerics and other healing classes work well to keep a Nightmare Reaper healthy enough to continue attacking and maintaining its Heat gain. His health isn't the best either, so having another melee fighter like a paladin as your main front line is better than having a Nightmare Reaper in front all the time.
Even if they aren't the bulkiest of fighters, a Nightmare Reaper has a good set of options for taking out high-priority threats through their high damage and mobility.
Minimum requirements:
OS: Windows 7
Processor: i3 or equivalent
Memory: 4 GB RAM
Graphics: NVIDIA Geforce GTX 670
Storage: 4 GB available space