Vincent is the first monster available for Guild battle. It plays out like a regular guild battle, and the monsters do not attack your party. Unlike PVP guild battles, you must defeat all of the opponents in the time allotted to claim victory. Like regular monster battles, your victory earns you loot based on your activity. Presumably the activity points you earn also go towards your guild's "monster points" tally.
Skeleton Soldier - Level 40 - 120 HP - special ???
Lesser Werewolf - Level 50 - 130 HP - special ???
Succubus Minion - Level 60 - 170 HP - special ???
Vampire Acolyte - Level 65 - 210 HP - special ???