The Writhing Coil alternates a ramping Death Rattle group burn with an Uncoil intermission in which the boss splits into five snakes whose remaining combined health becomes the boss's health after Assimilation. Keys die to a missed Vine Grip break, to unkicked Toxic Atrophy stacks gutting group damage, and to the Synchronized Venom DoT overlapping intermission damage.
Kick list: Toxic Atrophy
Every snake in the coil rattles at once, dealing stacking Physical damage to the whole group every second, and the rate of new applications accelerates the longer it runs.
The moment the cast starts, everyone attached by Vine Grip sprints away from the boss to break the rattle; if the group does not break it, the key wipes.
Orweyna ties players to the Writhing Coil with vines during Death Rattle; enough attached players moving 10 yards farther from the boss forces it to Uncoil.
Pre-plan a run direction, then sprint straight out with movement abilities until the vines snap and the intermission begins.
The boss rips apart into five Uncoiled Writhes with a burst of group-wide Nature damage; all damage the snakes take persists after they reform through Assimilation, and on Mythic+ they fixate players with Spiteful Hunt and apply stacking Spiteful Venom in melee.
Treat the intermission as the burst window: stack the snakes, cleave hard, kite or crowd-control the snake fixating you, kick their Toxic Atrophy casts, and step clear before Assimilation lands.
During Preparing Toxin the boss casts Toxic Atrophy three times in a row, and each cast that completes stacks 15 percent reduced damage done and a 10 percent slow on the whole group; the Uncoiled Writhes cast it too.
Rotate three interrupts through every Preparing Toxin sequence; letting stacks through slows your kill and tightens every later damage check.
The Writhing Coil burrows across the ground in a line for heavy Nature damage, then follows up with a Venom Jet cone sprayed at one player.
Step out of the charge path, then immediately check the boss's facing so nobody stands in the Venom Jet cone that follows.
The boss slices its current target with a bladed tail for very heavy Physical damage.
Tanks hold active mitigation for each Tail Scythe instead of spending it on white swings.
The boss spits venom at every player, dealing an upfront Nature hit plus a ticking DoT that runs for 35 seconds.
Healers plan sustained throughput for the full DoT duration and call for personals if it overlaps Death Rattle or the Uncoil intermission.
Mitigate Tail Scythe, group the Uncoiled Writhes tightly for cleave, and face the boss so Venom Jet and Burrowing Charge threaten nobody.
Budget for Synchronized Venom ticking the full 35 seconds and keep the group topped while Death Rattle stacks climb before the break.
Hold burst for Uncoil, spread interrupts across the Toxic Atrophy sequence, and crowd-control the snake that fixates you before it reaches melee and stacks Spiteful Venom.
When Vine Grip attaches you, run; the break only happens when enough attached players clear the extra 10 yards.
Tyrannical: The Uncoiled Writhes carry far more health, so the intermission becomes a real damage check; commit major cooldowns to Uncoil, keep every Toxic Atrophy kicked so group damage stays intact, and respect Synchronized Venom overlaps because the ramped tick damage will kill anyone who ignores it.
Sources: Wowhead: Altar of Fangs Dungeon Overview (Midnight Season 2 Mythic+) · Wowhead: Altar of Fangs zone and encounter journal · Warcraft Wiki: Altar of Fangs · Icy Veins: Altar of Fangs Dungeon Guide (Petko)
