create a mob that looks like a magma_cube which has the following appearance: 'Create a Magma Cube with a cracked obsidian texture that glows faintly with swirling lava veins beneath the surface, making it look like a living volcano core pulsating with heat.' and the following behavior/capabilities: 'Make a Magma Cube that can temporarily harden its outer layer into obsidian armor to reduce damage and create small lava puddles when it lands from jumps that slowly damage players and mobs standing on them.'
