Effectively the same as Final Fantasy's Flan monster type, Amoebas are immune to physical damage except for Firefly shotgun shells or Grenade rounds. Combustion, Necrosis or Pyrokinesis work very well as they have low HP. Their attacks can inflict status ailments so don't let them get close. They can be hard to notice when they are inactive as they are extremely small.
These enemies are weak but they have a lot of defense but they can be damaged by Fireflies or Grenades along with PE. Their attacks can inflict Silence so you may want to keep grenades or Fireflies just in case their attacks hit home..
This enemy features a lot more HP than the Green Amoebas and give some of the highest amounts of MP in the game. Red Amoebas cannot be taken out even with a single use of Combustion but Necrosis can easily kill them. Their attacks inflict Berserker instead which makes them slightly easier to fight.