Monsters are sentries created to fight enemies. They are XANA's main way of seeing its plans through.
They appear at Towers activated by XANA but may also sometimes ambush virtualized warriors at random times.
Some monsters can be mounted if they are on your side, allowing you to travel more easily.
Monsters differ in their own ways but have certain stats that they all share:
Whenever XANA activates a tower, the group of monsters that will protect it will always have a Sentinel.
Sentinels are monsters that will prevent the deactivation of the tower if they are not killed first. They can be identified through their noticeably bigger size.
Possessed warriors will count as sentinels as well, and must be devirtualize to deactivate the tower if they are nearby. This also goes for jeremiefied warriors with towers activated by Jeremy.
Wandering monsters are groups of monsters that are virtualized near warriors to ambush them.
They have a 50% chance (100% if XANA has an activated tower in the Sector) of appearing every 5 minutes if there are no monsters around already.
The Scyphozoa has a 1% chance of replacing a wandering monster ambush in surface sectors, the Cortex and the Volcano Replika and 5% in Sector Five.
All monsters currently on MRCL are: