Vasa Nistirio

Vasa Nistirio is one of the bosses encountered in the Chambers of Xeric. One of the former Arceuus elders, he accompanied Xeric during his exile and became mad over time.

Mechanics
Vasa Nistirio is initially seen as a pile of rocks. Upon approaching the pile, he will animate himself and start the fight. He will also raise a purple flame at the entrance, which will damage players who pass through it. The fight begins with his special attack.

Vasa has a special attack that he can use when he is at the centre, where he will teleport everyone in the room. Half of the team will be teleported to the edges, while the remaining half will be teleported next to him (if soloing, you will always be teleported to him). Those next to him will be stunned and have their prayers disabled. Those teleported to the edges should run to the center and active Protect from Magic. Vasa will unleash a magical barrage against everyone next to him, dealing massive damage. Players inside of the attack with Protect from Magic on will take 0 damage and reduce the damage dealt to the players who are stunned by half. He is immune to attacks while charging his special attack. Players unprotected by the attack will be dealt damage equal to their remaining Hitpoints minus 5, calculated when Vasa teleports them.

For teams, the player with the least amount of Hitpoints should initiate the battle in Melee gear and stand next to him; then, teammates should cross the flame and use Protect from Magic next to him. After his magical attack, players can switch to Protect from Missiles. If the team has overloads, using them before entering the room is a good idea. Solo players will have to take the special attack's full effect (at the start of the fight as well as any consequent times), but they can heal between the teleport and taking damage to not risk being at 5 Hitpoints.

It is recommended to use the Protect from Missiles prayer, as while walking to the crystals, Vasa will throw rocks at the team, which can deal significant damage. Fortunately, these rocks can be avoided by running away from the spot they are thrown at (the rocks have a 3x3 area of effect). Ranging is recommended against Vasa, and due to his high Magic level, he is weak to the twisted bow.

Throughout the fight, Vasa will move towards a cluster of crystals, which are located in the corners of the room. These crystals will heal Vasa, so it is important to target them as quick as possible to minimise the amount of healing he can perform. They are weak to stab attacks. After healing enough, Vasa will use his special attack upon returning to the middle of the room. Otherwise, he will walk to another set of crystals.

Players under Vasa will take rapid stomp damage from him.

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