Nylocas Vasilias

Monster
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EntryNormalHard
Nylocas Vasilias
Released3 June 2021 (Update)
MembersYes
Combat level301
Size4x4
ExamineOne of Verzik's rather large pets.
League regionMorytania Morytania✓
Combat info
XP bonus+7.5%
Max hit24
AggressiveYes
PoisonousNo
Attack styleStab, Magic, Ranged
Attack speed4 ticks (2.4 seconds)
Combat stats
1,4401601405020140
Aggressive stats
Monster attack bonusMonster strength bonusMonster magic strength bonusMonster ranged strength bonus
+0+40+380+460+0+40
Melee defence
+0+0+0
Magic defence
Fire elemental weakness
+015% weakness
Ranged defence
LightStandardHeavy
+0+0+0
Immunities
Poison100% resistance
Venom100% resistance
Advanced data
Monster ID10786,10787,10788,10789
LinkMOID

Nylocas Vasilias is the third encounter in the Theatre of Blood, and spawns after killing off the hordes of Nylocas Hagios, Ischyros, and Toxobolos.

A trio of players fight the Nylocas Vasilias.

Mechanics

Vasilias changes its combat style throughout the fight by changing its carapace, which also indicates its weakness: blue for magic, green for ranged and white for melee. Attacking it with the wrong combat style will cause it to reflect the hit back towards the player as well as healing from the hit. It will change every 10 ticks (6 seconds), and it will always change to one of the other two styles (meaning it will not stay on one style twice in a row).

Hard Mode

In hard mode, Vasilias will fire its ranged attack at everyone standing within 2 squares of its target. It is advised to spread out with a 3-tile gap from other players in your party when it turns green.

Its magic attack also has a special mechanic where it will bounce off of the player it hits and will spread to every other player. This attack deals the same damage to every player it hits for the damage it deals regardless if they have Protect from Magic up or not. This damage is reduced by 50% if standing within two tiles of the target. If the players are all on the same tile then the attack will only damage the target.

Entry Mode

In Entry Mode, all of the nylocas in the encounter can scale down to 20% of their original Hitpoints when done in a solo party. Despite everything dealing lower damage however, this room can prove to be overwhelming to solo players who are not prepared since the number of nylocas the players must kill during the hordes are the same. The room is still failed if all 4 pillars fall.

The boss takes longer to switch colours compared to regular and hard mode. This gives the players more time to switch their prayer and gear while fighting the boss.

If a team wipes in Entry Mode, they will be taken back outside of the boss room and have unlimited attempts to fight the boss again. Hardcore ironmen will still lose their status upon death.

Drops

Item Quantity Rarity Price High Alch
Arachnids of vampyrium.png: Nylocas Vasilias drops Arachnids of vampyrium with rarity Always in quantity 1Arachnids of vampyrium1Always; Never[d 1]Not soldN/A
  1. ^ No longer dropped after reading the book.

The various colours of Nylocas Vasilias' carapace during the fight.

Changes

Date Changes
25 June 2025
(Update)

The Nylocas Vasilias now has a 15% elemental weakness to fire spells.

24 July 2024
(Update)

Nylocas can now be affected by burn damage.

3 June 2021
(Update | poll)

Hard mode and entry mode versions of the Theatre of Blood encounters added.

21 June 2018
(Update)

The Nylocas Vasilias' Hitpoints were increased from 2,000 to 2,500 (in teams of five players) and its damage output was increased, raising its maximum hit from 58 to 70. It also now reflects and heals 100% of the damage done with the incorrect style instead of 50%.

Trivia

  • The word "Nylocas" is very similar to the Hungarian word "Nyolcas", meaning "eight", referencing the eight legs of this arachnid-like creature.
  • The latter part of the name of the Nylocas Vasilias likely derives from the Greek term "βασιλιάς" ("vasiliás"), meaning "king", referencing its background within the lore and its role as a boss encounter.

Source

Content from the Old School RuneScape Wiki (operated by Weird Gloop), licensed under CC BY-NC-SA 3.0.

Source siteOld School RuneScape Wiki
Canonical sourceNylocas Vasilias
Content licenseCC BY-NC-SA 3.0
License statusdeclared
PictureNylocas Vasilias (melee) · file details

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