Fathom-Lord Karathress Guide: Strategy, Abilities, Loot

Last updated on Aug 31, 2021 at 00:44 by Sellin 1 comment

Fathom-Lord Karathress is the fourth boss you will encounter in the Serpentshrine Cavern 25-player raid instance. Not only will you be facing the Fathom-Lord but his three Fathom-Guard followers as well, each with unique abilities that you will need to assign groups within the raid to handle.



Fathom-Lord Karathress is the fourth boss inside the Serpentshrine Cavern raid instance. The Fathom-Lord fight features four bosses all with unique abilities that will have to be handled by the raid. Fathom-Lord grows stronger with the death of each of his Fathom Guards gaining one of their signature abilities as you defeat them during the encounter.


Role-specific Tips for Fathom-Lord Karathress


Healer tips

Healing assignments are extremely important on this boss as there will be three to four tanks taking damage at a time in the beginning of this encounter.

Have healing/damage mitigation cooldowns ready for The Beast Within IconThe Beast Within; the time that this ability is active on either Karathress or Sharkiss is the highest damage taken per second for this encounter.


DPS tips

Spitfire Totem IconSpitfire Totem is always the most important target in this encounter. If you see it active switch to it and kill it immediately.

A Warlock or Rogue should be assigned to the group handling Fathom-Guard Caribdis. Cast-speed-slowing effects such as Curse of Tongues IconCurse of Tongues or Mind-numbing Poison IconMind-numbing Poison can make interrupting considerably easier.


Tank tips

The tank holding Fathom-Guard Sharkkis needs to be ready to pick up the minions he will be summoning throughout the boss. Protection Paladins and Feral Druids often have an easier time generating threat on both the boss and these spawns.


Fathom-Lord Karathress Abilities

Each boss in the Fathom-Lord Karathress encounter has unique abilities; below is a list breaking down each of these boss' abilities.


Fathom-Guard Sharkkis

  • Multi-Toss IconMulti-Toss — Targets three random players and deals Physical damage.
  • Leeching Throw IconLeeching Throw — Drains the health and Mana of a target over 12 seconds.
  • Summon Fathom Lurker IconSummon Fathom Lurker — A small Elemental will spawn which will cast Knock Away IconKnock Away causing a small knockback and wiping its threat on that target. On death it will cast Spore Explosion IconSpore Explosion which deals AoE damage in a small area around the Elemental. This mob is immune to crowd control effects.
  • Summon Fathom Sporebat IconSummon Fathom Sporebat — The Sporebat will also cast Knock Away IconKnock Away as its only ability. This mob is immune to crowd control effects.
  • The Beast Within IconThe Beast Within — Increases the damage done by Sharkiss by 30% and his pets by 50%.

Fathom-Guard Tidalvess

  • Spitfire Totem IconSpitfire Totem — Will deal massive damage to 5 targets; this totem should be the highest priority at all times.
  • Poison Cleansing Totem IconPoison Cleansing Totem — This totem will dispel a poison effect every few seconds.
  • Earthbind Totem IconEarthbind Totem — This totem will apply a slow effect on all players near it.
  • Frost Shock IconFrost Shock — Damages the highest-threat target and slows.

Fathom-Guard Caribdis

  • Water Bolt Volley IconWater Bolt Volley — This is an instant cast dealing Frost damage to all players in range.
  • Summon Cyclone IconSummon Cyclone — A tornado will spawn roaming through the room. Anyone it comes in contact with will be affected by the Gusting Winds IconGusting Winds debuff making their cast speed twice as long for its duration.
  • Tidal Surge IconTidal Surge — Targets a random player and freezes them along with anyone within 10 yards of the target. Spreading is crucial to minimize its effect.
  • Healing Wave IconHealing Wave — Every 15 seconds Caribdis will attempt to cast Healing Wave which will do a massive amount of healing. Assigning interrupters for this ability specifically is extremely important.

Fathom-Lord Karathress


Strategy for Fathom-Lord Karathress


Pulling the Boss

Fathom-Lord is a boss that will likely require three tanks. It is crucial for the raid to determine who is going to tank what boss and who will be healing those tanks. It is also important to assign a Rogue or Warlock to the Caribdis group to apply a cast speed slow so kicking is easier.


Kill Order


Boss Encounter

On the pull the pre-assigned group should separate Caribdis from the rest of the raid to minimize the impact of his casts should they get off. Having a preset interrupt rotation for this group is important to stop all of Caribdis' casts. This group also needs to make an effort to be spread around Caribdis to minimize the effects of Tidal Surge IconTidal Surge.

The entire raid should be focusing on killing Tidalvess first but you can stack the three remaining bosses and cleave them down. However, do not reduce Fathom-Lord Karathress' health below 75% or he will gain the Blessing of the Tides IconBlessing of the Tides buff and likely wipe the raid. Once Tidalvess and Sharkiss are dead you can switch over and kill Caribdis. Spreading after the three Fathom-Guards is very important to reduce the effects of Tidal Surge IconTidal Surge.


Fathom-Lord Karathress Loot

Item Item Type Slot
Leggings of the Vanquished Defender Icon Leggings of the Vanquished Defender Tier Token Legs
Leggings of the Vanquished Hero Icon Leggings of the Vanquished Hero Tier Token Legs
Leggings of the Vanquished Champion Icon Leggings of the Vanquished Champion Tier Token Legs
World Breaker Icon World Breaker Weapon Two-Handed Mace
Sextant of Unstable Currents Icon Sextant of Unstable Currents Accessory Trinket
Fathom-Brooch of the Tidewalker Icon Fathom-Brooch of the Tidewalker Accessory Trinket
Frayed Tether of the Drowned Icon Frayed Tether of the Drowned Accessory Necklace
Bloodsea Brigand's Vest Icon Bloodsea Brigand's Vest Leather Chest
Soul-Strider Boots Icon Soul-Strider Boots Cloth Boots


  • 31 Aug. 2021: Guide added.
Show more
Show less