FrankCheck out Wowhead's page for Windrunner Spire, coming in Midnight Season 1
Trash Mobs
All Wings
You will see the following mobs throughout the dungeon:
Spellguard Magus
Arcane Salvo – A channeled spell that randomly AoE bolts everyone in the group.
Spellguard's Protection – At 50% health, the Magus will drop a protective zone, stopping 99% of damage done within.
Dutiful Groundskeeper
Shear Armor – A stacking tank debuff that reduces armor. Run and kite if you need to drop.
Restless Steward
Spirit Bolt – Bolt slop.
Soul Torment – Dispellable DoT targeting random player.
Windrunner Soldier
Precise Cut – Reduces healing received by 10%
Emberdawn Wing/Vareesa Wing
Territorial Dragonhawk
Fire Spit – Channels firebolts into a player quickly, can be made faster by Bolstering Flames.
Bolstering Flames – Purgeable buff that increases the haste of the dragonhawk by 30%. Removed when shield is taken down.
Spindleweb Hatchling
Acidic Demise – This mob has a buff that will drop a small poison pool when they die.
Creeping Spindleweb
Poison Spray – Instant-cast Poison on random target.
Acidic Demise – This mob has a buff that will drop a large poison pool when they die.
Apex Lynx
Puncturing Bite – Bleed on the tank.
Ferocious Pounce – Target will jump on three players in succession.
Scouting Trapper
Freezing Trap – Frost traps that will stun for 5 seconds if walked over.
Bloated Lasher
Fungal Bolt – Bolt slop.
Spore Dispersal – AoE DoT and buffs/engages nearby Pesty Lashlings with Sporecharged
Pesty Lasher
Sporecharged – Does additional melee damage, grab aggro quickly to avoid DPS getting killed.
Derelict Duo Wing/Sylvannas Wing
Fervent Apothecary
Phial Toss - Throws an AoE swirl on the floor, denying the area for a moment with Shattered Phial
Zealous Reaver
Fierce Slash – Tankbuster, hard to see visual cue.
Ardent Cutthroat
Shadowrive - Shadowstep-attack on random player.
Poison Blades - Interrupt, otherwise will stack a poison on tank.
Devoted Woebringer
Shadowbolt - Bolt slop.
Pulsing Shriek - Places a shield on itself, needs to be destroyed before being able to interrupt the pulsing AoE.
Flesh Behemoth
Fetid Spew - Two players are selected for an AoE pulse for 8 seconds.
Fetid Bile - Drops after completing Fetid Spew cast, requires moving the mob out of large AoE zone.
Brutal Chop - Tankbuster.
Commander Kroluk Wing
Swiftshot Archer
Shoot – Stands stationary and shoots at random players
Arrow Rain - Multiple small-AoE circles to avoid.
Phalanx Breaker
Break Ranks - Charges through the group, damaging and knocking people away that are in the path.
This visual shows up a second or two into the cast sequence, so keep an eye open
Interrupting Screech - AoE interrupt on the group.
Haunting Grunt
Intercepting Charge - On aggro, charges their target. Make sure tanks are the one to pull, especially on Kroluk encounter.
Loyal Worg
Shred Flesh - Causes a bleed that damages and puts a heal absorb on the target. Removed when absorb is removed.
Spectral Axethrower
Throw Axe - Spams, throws at random players and will leave a DoT.
Lingering Marauder
Gore Whirl - Stationary whirlwind.
Phantasmal Mystic
Chain Lightning - Chain casts, interrupt when you can.
Flame Nova - Hard-hitting AoE.
Ephemeral Bloodlust - Hero for the enemy group, casts when low health.
Bosses
Derelict Duo
When pulling this boss, try and interrupt Kalis' Shadowbolt to move her around for cleaving. Latch's main attack is Bone Hack which will hit the tank and leave a 3 second DoT. After a little bit, Latch will cast Spattering Spew which will leave a puddle of Gunk Splatter, creating some area of denial for the fight.
Kalis will target two players with 
Curse of Darkness, which will spawn an add on each player, immune to damage and fixated to chase them for 12 seconds. Removing the curse removes the add, otherwise kite it to avoid taking damage.
The main mechanic of this fight is Debilitating Shriek where Kalis will AoE the group every 2 seconds, ramping the damage output by 30% each pulse. To stop this, Latch will also cast Heaving Yank on a player. This hook will pull the player in and hit them with Heaving Chop which will stun you for 6 seconds if it doesn't kill you. You can, however, position yourself to have Kalis be hooked instead of the player, and this will interrupt her channel, and continue to the fight.
The person who will get hooked has a red marker over their head, and it shifts to the hook target based on who is within line of sight of the incoming hook. Ensure it's over Kalis' head
Ensure both bosses die together to not trigger Broken Bond, giving the remaining boss a 50% buff every 5 seconds until it's killed.
Emberdawn
This is a fairly straight-forward fight. Every so often, Emberdawn will target two players with Flaming Updraft, a DoT that after 6 seconds will drop a Ignited Embers on the floor. You want to position these twisters on the edge of the room.
After Emberdawn hits 100 Energy, it will begin casting Burning Gale where it will be constantly damage the group, fire off frontals in different directions, and this will also trigger the Embers to eject Flaming Twisters in different directions across the arena. A lot of constant dodging and movement in this phase.
Other than this rinse and repeat, the tank will be hit with Searing Beak a tankbuster DoT.
Commander Kroluk
This fight starts off with Kroluk smashing the tank with Rampage, which will hit the tank several times over 5 seconds, so ensure active mitigation is up.
He will then choose two random players in the group (most likely the two furthest away at the time of cast) to Reckless Leap to. Each time he lands, he will crash the ceiling down all over the arena, so prepare to find a safe spot between both jumps.
On the second landing, he will immediately begin casting Intimidating Shout, which every player needs to stack with a partner (or altogether) to ensure they aren't hit with a DoT and 6 second fear. You will know you're safe when the circle around you turns white.
After 2 or 3 rotations of these spells, he will then begin casting Rallying Bellow, summoning 4 Haunting Grunt, a Spectral Axethrower and a Phantasmal Mystic. Until these mobs are dealt with, he will chase a player around the arena using Bladestorm, so be ready to reposition yourself if he is close.
The Restless Heart
The final fight of Windrunner Spire requires a lot of movement awareness, starting with the first spell that will be cast soon after pull, Arrow Rain.
This is a critical mechanic to the fight, because if you touch one of the Turbulent Arrows, you'll be knocked up in the air and form a Storming Soulfont , but also remove any stacks of Squall Leap. Each player will get the stacking Squall Leap debuff every time the Heart jumps in the air. This includes before using Arrow Rain and when it casts Bullseye Windblast where the Heart will jump away, and fire across the room to the opposite edge. Get out of the initial impact, and prepare to use to use the Turbulent Arrow to jump over the creeping Billowing Wind.
Every so often, she will also choose a player to spam a 5 second channel/frontal on called Bolt Gale. This person should point this channel away from any other players, as hitting additional players will most likely overwhelm the healer.
To help alleviate the area of denial created by Storming Soulfont, the Heart will start by casting Tempest Slash on the Tank, increasing their damage taken by 200% debuff (and can also be removed by touching a Turbulent Arrows), but will immediately follow up with Gust Shot, allowing the three selected players to try and use the reticles to remove any Storming Soulfont on the floors.
