The Capsarius is a slayer monster requiring 81 Slayer to combat. Described as a 'healer', it is a member of the Order of Ascension.
These monsters are found in the Monastery of Ascension located between the Feldip Hills and Mobilising Armies, along with Gladii, Scutarii and Rorarii found within the dungeon. When a Capsarius is near a monster that is being attacked, the monster is healed by 100 every two ticks. While being healed, the targeted monster also gains a massive damage reduction buff against all incoming attacks, so they must be killed immediately once they start healing nearby members.
They also feature in Nomad's Elegy together with the other Ascension creatures.
This monster's name comes from the Latin word 'capsarius', meaning a slave who took care of things. Usually this was referred to those who served as help for doctors practising medicine, which bears similarities to this monster's ability to heal other monsters.
They appear to be female, yet have a masculine Latin name (rather than being called "Capsaria").
This monster and the other monsters in the dungeon are the first to have a weakness to a generic attack style (in this case, Ranged). These weaknesses were previously restricted to players.
After a hidden update regarding the Monastery of Ascension, Capsarius are now able to drop battlestaffs and some equipment. Prior to this update, they only dropped their weaker staff counterparts and some noted items.
A hidden update increased the healing radius of the Capsarius.
Sometimes, a rare glitch may occur where a Capsarius has died before it is able to heal. When this glitch happens, the monster it was supposed to be healing will gain the defensive buffs without healing, making it hard to kill monsters affected by this. This happens in places with Capsarius and in Legio Tertius' room.
When healing, there are a few exceptions:
If a Capsarius dies while healing a target, that target will still retain the shields for three ticks.
If a Capsarius is stunned while healing a target, that target will retain the shield for a tick, then lose the shield until the stun effect wears off.
If there are multiple wounded targets, the Capsarius randomly heal one of the targets. Upon attacking one of them, the Capsarius will immediately heal your current target.