Stack marker

A stack marker splits the damage between everyone within the marker. If nobody stacks to share the damage, it will usually kill the target. There are multiple variants of the stack marker.

Overlap penalties

Certain duties may spawn multiple stack markers at once. In most instances (except for Syrcus Tower), stack markers should NOT be overlapped! Mechanics with multiple stack markers will generally apply severe vulnerability debuffs to all players inside for a few seconds. These debuffs fall off harmlessly if a player participates in only one stack. However, anyone who participates in multiple stacks will still have the debuff when the second stack hits, making them take severe or fatal damage.

Types

Circular stack marker

Circle stack

The most common variant traces a circular shape around the target. Everyone needs to stand within this circle to split the damage with the targeted player. Standing directly on top of the targeted player also works, but is more cautious than necessary.

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Line stack marker

Line stack

A line stack marker splits the damage between everyone that stands in line with the targeted Player and the boss. Visually, attacks like this generally involve the boss firing a laser through the target.

To participate, a player only needs to be within the line, they do not need to be inside the actual marker. In the example image, standing further north but still being within the east-west bounds of the line will still count for splitting the damage.

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Multi-hit stack

A multi-hit stack is the same as a stack marker, but will hit multiple times. While a regular stack displays 5 arrows (1 above and 4 in a cross), a multi-hit stack will display multiple arrows in each direction (generally 3 arrows each). This is most-commonly used for "Akh Morn", an attack frequently used by dragon enemies.

Participants need to stay together until all hits of the stack finish. Leaving too early means participation will not be counted for later hits.

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  A multi-hit stack marker
• 
  A multi-hit line stack marker

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Shared Tankbuster

A circle stack marker with a red coloration and a variable number of orbs above the targeted tank. The requisite number of tanks must position themselves inside the ring to share the damage.

An example of this is Twin Pom Meteor in Thornmarch (Hard).

In high-end duties, a common strategy of dealing with these is to simply have one tank take it solo with an invulnerability cooldown.

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  A shared tankbuster requiring 3 tanks.
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  A multi-hit shared tankbuster intended for 2 tanks.

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Multi-Player Marker

An attack, commonly referred to as Enumeration, that requires a either a minimum or an exact number of players to group together or else face punishment. Represented by a circle with a varying amount of spheres floating above it. The amount of spheres indicate the amount of players that must be inside the circle.

In Heavensward, most commonly the Alexander raids, these markers require an exact number of players: if there are 3 spheres, then exactly 3 players must be inside the circle. 4 players does not count, it must be exactly 3.

However, in newer duties, the most common indicator is a blue circle with two spinning pyramids, in which case at least two players must be in it. In high-end duties, usually four of these appear at once, requiring the entire party to divide into pairs.

Rarely in some high-end duties, a normal stack marker may be treated as an Enumeration— requiring a minimum number of players (e.g. 4) to be inside. If there are too few, all inside are defeated instantly.

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  A stack marker requiring exactly 3 players to stand together inside. Only appears in Heavensward.
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  A pair stack that requires at least 2 people. More commonly seen.

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Wild Charge

An advanced variant of the Line Stack Marker. One player is targeted and will take increased damage, requiring the group to stand in front of them to save their life. Additionally, the player closest to the boss often takes increased damage, requiring the tanks to be the closest to the boss while the DPS and Healers stand between them and the targeted player.

"Wild Charge"-style attacks typically do not have a unique marker.

The only example of a Wild Charge marker is Silkie's Slippery Soap attack from Another Sil'dihn Subterrane, which uses a line stack marker with the vertical orange arrow offset to the back.