Lich

The last Assassin-type enemy, and the third strongest one, as its stats are right below those of the Stalker. However, this monster is every bit as dangerous as the Shinobi due to possessing its same Stored Attack: Forced Purging, which reduces your Burst percentage to 0 and also can make your Reyvateil's Song Magic explode, dealing little damage and leaving her incapacitated to sing for a brief amount of time. Therefore, interrupting that attack should be your utmost priority in every battle where these monsters appear, so you can charge a Song Magic or Flipsphere faster and finish up the battle as fast as possible.