You need a form of at least 3 people (4 recommended) When ready, go to the southwest corner of Devasted Clearing and go down. One person in the form will take some damage by walking through this room. Follow the path and when ready, go down. The mob will adjust to your form size and level.
Randomly, a person in the group may be eaten and thrown into a no-recall no-exit room that does acid-damage every tick and lowers acid-prcnt. To get that person out, one person should continue fighting the mass while another person should flee and kill an anchor in an adjacent room (if one person isn't fighting, it won't let you flee - which is why you need 3 people minimum for this boss).
- Assign 2 or more players (those with lowest combat capabilities and responsiveness) to *stay in combat with Mass at all times*. If they do not stay in combat, the entire form may end up in the deathtrap.
- Assign 2 or more players to respond and rescue when someone gets sucked into the deathtrap - these players should reserve stamina and SP to quickly kill an anchor as required.
a ring of the bulwark oak - grants +ar, -healing-others, -damage
This is one of a set of 3 rings available from the RF bosses intended for specific form roles of tank, supporting healer, supporting damage.