Merciless Spam (Merciless)

Merciless Spam is an event stage that only appears on the 1st of December and is only available after beating Chapter 3 CoC.

Overview
At the start, no enemies appear. When the enemy base has has 1000 damage dealt to it 10 Dark Magicians and 1 J. Ester appear. After 120 seconds, 15 more Dark Magicians appear. This repeats 3 times.