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This guide is an edited version of the reddit post by Steelsauce#0251.
Preface
Similar to 
Into the Mist, it's not just surviving with enough DR - you need to kill quickly before your affliction stacks up too high. At high enough stacks, some attacks can kill you even at full hp. Obviously you want to switch combat styles to your advantage for all non-boss mobs.
Agility and Astrology
Get a large amount of combat supplies and choose all the combat buffs you can from Agility and Astrology.
| Example of bonuses
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Agility upsides:
- 3% melee max hit
- 13% melee evasion
- 5% accuracy for all styles
- 40 HP
- 8% damage to all monsters
- 1% DR
- 8% damage to slayer area monsters
- 10% food healing value
- 5% autoeat efficiency
- 10% ranged and magic efficiency
- 50 HP regen
- 5% slayer area negation
- 5% max hit added to min hit
Agility downsides:
From Astrology, it's total of 20% accuracy rating, a bit of min hit, life steal, and damage bonus from equipment.
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Auxiliary Gear
Diamond Luck Potion IV is the main option, but you could try DR potions too.
For prayer on hard mobs, use Protect melee/range/magic along with battleheart or piety/rigour/augury. You only get affliction stacks when you get hit, so the protect prayers let you have more max HP for longer. On easy mobs, just use battleheart. No shame for using protect item but it will make it harder to clear.
Dragon summon is very useful for this dungeon.
Use perfect whales since you have to manually eat. Always use max cape, have one in each loadout.
Enemy Modifiers
Avoid modifiers that prolong the fight. This means no heal hp%, extra slayer area effect, or life steal. Avoid +DR, +Evasion, -attack interval and +affliction chance.
Always take immunity to slow, and immunity to stun (swap out fighter necklace). Don't be afraid of +x% max hit because almost all scary attacks are the enemy abilities that are not affected by this modifier.
Gear
In general, the unhallowed wasteland is more difficult than the boss Bane. Because of the slayer area effect, you absolutely want 100% slayer affect negation. For magic, use Fire Surge with the Surge II and Decay sometimes. Instead of Fire Surge, Incinerate might work, but it was not tested.
The builds are as follows:
Each build has mastery slayer gear in the passive slot, for a total of 9 pieces of master slayer gear. This is the only way to reach 100% slayer area negation, so the enemies don't heal. And when the enemies have 12-20k hp and keep stunning you, you really don't want them healing 20% of their hp every other turn.
Technically you can get away with only having 6 pieces of master slayer gear and switching out a piece from another set to your current passive slot. But you have to swap gear extremely quickly, because as soon as the monster spawns they start attacking you for 700-1180 damage. And the longer you fight the more your max HP falls. When a new mob pops up you need to switch your gear set and prayers quickly, while watching your hp and eating if it drops. Messing around in your bank makes it a lot harder. During the test runs, all four deaths were due to skeleton dragons and their -10% dmg reduction and the 750 dmg stun attack.
The Fight
Unhallowed wasteland is considered the hardest part. All four mobs can kill you quickly, and their max hit changes based on their moves.
Read their abilities carefully, kill them quickly before affliction stacks up. You have to always be ready to eat in an instant. May want to use protect item if you don't know their abilities well. Start in this zone so if you die you waste less time.
After clearing unhallowed wasteland, the rest of the mobs are fairly easy if you swap to what they are weak to. You can also use more non slayer equipment for more dps: melee, ranged, magic. The exception is Rokken that can easily kill you very quickly depending on your modifiers. Always use protect range, and if you get stunned, keep eating until he uses elusiveness and let the stun fall off. Save the Perilous peaks for last because it's the easiest area to fight the final boss.
Finally, Bane. He appears using a random combat style and you must use the same one. Use your dps setup without the slayer gear. Use protect melee/ranged/magic and one of the last four prayers. With the protect prayer, the perilous peaks effect is basically negated. He heals and applies affliction, so it's a race to out-dps him. He cannot be stunned or cursed. Each time you kill him you get a reward: melee shield, ranged shield, mage shield, ring. Use this gear for the rest of the event!
The most important thing is to keep your hp above 50% during its Suffocate move. The sleep really makes it tough to do enough damage. Otherwise, keep an eye on his max hit and eat if you drop below it, and be careful when he applies -30% DR. Don't eat when you don't have to or you won't deal enough damage. Overall, the Bane is not as hard as the wasteland.
After 5 rounds of slayer areas, you face the final boss, Bane, Instrument of Fear. Besides all the modifiers, Bane now has more HP, max hit and an OP attack he spams. Same strategy as before, but you probably want to spam-eat through its Overwhelming Power move. Kill him to earn a lore book, and a cute new pet. Congrats!
Slayer Helmet (Master)
Fighter Amulet
Slayer Platebody (Master)
Ragnar God Platelegs
Ragnar God Boots
Ragnar God Gloves
Hunter's Ring
Tidal Edge
Recoil Shield
Maximum Skillcape
Whetstone
Slayer Wizard Robes (Master)
Slayer Cowl (Master)
Deadeye Amulet
Slayer Leather Body (Master)
Aeris God Platelegs
Aeris God Boots
Aeris God Gloves
Shockwave
Earth Layered Shield
Jadestone Bolts
Slayer Wizard Hat (Master)
FEZ
Glacia God Platelegs
Glacia God Boots
Glacia God Gloves
Ocean Song
Wizard's Scroll
Combat:
