Embuk kicked and swam for all he was worth through the cold waters of the underground lake. He prayed that the horrible creature could not cross the water.
A trail of ashes behind the thing were all that remained of his companions Maluk and Zefram. They had tried to fight back after the cube-like monstrosity slammed into them at the intersection of hallways. They had not noticed it coming.
It was as the rumors had said, a wizard had dropped his powerful wand of fireballs only to see it engulfed by a massive nearly invisible cube of slime. Now, imbued with the elemental energies of the wand the creature wanders the caverns and worked hallways beneath the ruins incinerating its victims.
Zefram had struck it full on with the point of his spear only to suffer a retributive blast of flames gushing from the wound. Maluk fared no better, though he did not become paralyzed, the thing wrapped itself around, absorbing him. Within its transparent form he burned to charred cynders over the next several seconds, writhing and screaming the whole time.
Embuk fired his crossbow and sadly sealed Zefram's fate as another gout of fire burst forth and down Zefram went. The thing lurched forward over his fallen companion and Embuk ran.
Burning Cube (unique monster)
Number encountered: 1
Movement: 60 (20)
Armor Class: 8
Hit Dice: 6
Damage: 2d4 kinetic + 1d4 fire
Save: Fighter 3
Morale: 12 fearless
Special Defense: Attacks that break the membrane (piercing and cutting) cause a gout of fire to burst in a 10 by 10 foot area immediately in front of where the attack hit. Damage from this attack is 2d4 and a failure to save vs breath weapon indicates an additional round of burning for 1d4 damage unless extinguished.
Enveloped creatures suffer 2d4 fire damage every round until freed or dead.
The event that cause this cube to become a burning cube took away the paralytic and acidic nature of the original cube.