Nightmare

These monsters are improved versions of the Lollipops, and can only be found in Imperial, at the very end of Gaea. However, stats aside, they are rather weak in comparison to their predecessors due to the loss of their Rolling Slap skill, and instead, they substituted it with another called Big Swing, which only hits a party member once. Therefore, while they might take longer to defeat, they shouldn't pose any problems to the player after having trudged through the rest of Gaea.