Okay, that just leaves flavour text. What do you think of this.
A small lake of steel-grey slime that flows with disturbing purpose. A host of liquid tentacles ooze out of its surface, their tips solidify into a strange assortment of tools and nozzles.
The silver slimes of some military complexes have an additional stage to their life cycle, the megalium, a combat form that allows them to attack invaders must like antibodies fighting an infection. If intruders damage a complex maintained by these militarized silver slimes, the individual silver slime swarms and slugs flow together and form megaliums to repel or dissolve the invaders. If silver slimes are numerous enough, they can form megalium so immense they can envelop the ships the invaders landed in too. The commander of a slime-equipped military complex usually possesses the ability to trigger or cancel a megalium transformation from the facility's control center.
The transformation into a megalium takes only a round once sufficient silver slimes have congregated together. The megalium will break apart into many Tiny silver slimes if it takes sufficient damage to destroy it. These tiny oozes are exhausted from the effort of becoming a megalium, so need to feed and rest for at least a few days before they have the energy to gather into silver slime swarms.
A typical silver slime megalium is an aggregate of around ten or a dozen silver slime swarms or silver slime slugs. It is roughly 15 feet across and 1 feet thick and weighs from 5,000 to 10,000 pounds. The largest megalium can measure 100 feet across, about 10 feet thick, and weigh up to 1000 tons.
Combat
Unlike normal silver slimes, megalium aggressively pursue intruders and attack them with its weaponized pseudopods. Its pseudopods can do both normal and energy damage. A megalium randomly selects what type(s) of damage each of its pseudopod weapons does (so different pseudopods can do different damage) and if an opponent proves resistant to that form of damage it instinctively switches to another randomly generated damage type.
Megalium keep on attacking until they are destroyed or all their opponents have left the facility they are guarding.