This mod adds an invasion block, to be exact two blocks, the one is going to start the invasion and will be found in a structure, the other block continues the invasion. The starter block blinks when it invades touching blocks and sometimes spawns either the the mithrilium mite or the spreading mite.
The mithrilium mite becomes a mithrilium larva after some time.
When either the mite or the larva dies it burries itself and the block under it becomes invaded.
When the Spreading mite dies or sometimes when it gets hit it explodes and 3 mites pop out.
If any of the mobs kills an animal (theire agressive to it) it spawns an egg that hatches a mite after some time.