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This writeup is intended to be mobile-friendly as the UI can make switching difficult. Thus, there will be a focus on limiting the amount of switching necessary, from gear to prayers. Using a web browser or PC will help, as you will be able to swap gear much faster, but is not required. Using a PC will allow you to switch prayers, gear, or spells to optimize DPS, but these will not be discussed in depth.
Event Mechanics
Event mechanics are explained on the Impending Darkness Event page. In summary, you will need to clear 4 
Slayer areas a total of 5 times to complete the entire event. At the end of every area cleared, a harder Boss monster will spawn - it is simply a regular monster with extra combat modifiers. At the end of every round of 4 slayer areas cleared, 
Bane will spawn. You will have time to swap gear before starting the fight with Bane.
Setup
Equipment Sets
You will need to equip each outlined set as you will be switching between equipment sets frequently.
Gear is DR-focused for both mobile- and 
Hardcore-friendly completion. The rewards given while clearing the event are not required but may help with DPS if you so choose to use them. The 
Maximum Skillcape is non-negotiable, as fights take place in Slayer areas.
Slayer Negation Sets
This is the most important set and is targeted for 
Unhallowed Wasteland. You can use this set for the remaining Slayer areas, but it will be helpful to swap to God Armour Sets for better bonuses once completed.
Melee
If you choose the immune to stun modifier, substitute 
Fighter Amulet for 
Fury of the Elemental Zodiacs.
Ranged
Magic
God Armour Sets
The God Armour sets can be used for all Slayer areas beside Unhallowed Wasteland. Being mobile-focused, an emphasis on DR options is preferred. Thus 
Terran Armour and 
ELS are recommended for all 3 combat styles, but can be swapped for 
Ragnar Armour and DPS shields (
Dragonfire Shield and 
Scaled Shield) respectively if you feel comfortable, ELS should remain on your Magic set as it has no real alternative shield until you have killed the third Bane.
Melee
If you choose the immune to stun modifier, substitute Fighter Amulet for Fury of the Elemental Zodiacs. If fighting Bane, also use 
Ring of Blade Echoes in place of the 
Hunter's Ring.
Ranged
Magic
Agility Course
- Any
- Any
- Pipe Climb
- Coal Stones
- Cliff Balance
- Lake Swim/Rocky Waters
- Boulder Trap/Water Trap
- Raft Building/Pipe Crawl
- Ice Jump
- Ocean Rafting
- Pillar of Combat
Potions
Diamond Luck Potions for the entire event.
Astrology
Maximize combat-focused 
Astrology bonuses. However, the difference is relatively small, so don't focus on getting optimal bonuses.
Modifier Tier List
Listed from best (choose it) to worse (avoid it). All modifiers apply to the enemies, not the player. You can start and stop the event when beginning to fish for a decent first modifier. If you receive choices of modifiers or a series of modifiers after a few rounds that are completely awful, you can always restart the event for better RNG.
- +100% chance to ignore Stuns and Freezes and Immune to Sleep
- +20% Maximum Hit and -10% Maximum Hitpoints
- +20% Maximum Hit and +20% Accuracy Rating
- +2000 Maximum Hitpoints and -10% Maximum Hit
- +50% chance to apply poison when hitting with an attack and +10% Maximum Hitpoints
- +15% Damage Reduction and +15% Global Evasion
- +50% Chance to apply burn when attacking and +50% chance to apply frostburn when attacking
- +100% chance to ignore Slow effects and -5% Attack Interval
- +10% Maximum Hit, -10% Attack Interval, and -10% Global Evasion
- +15% chance to apply affliction when attacking and +15% Lifesteal
- Slayer Area Effects are 5% Stronger
- Heal 4% of current hitpoints every 2 turns and +40% of Maximum Hit added to Minimum Hit
Area Order
The recommended order of areas to clear is as follows:
- Unhallowed Wasteland
Dark Waters
Shrouded Badlands
Perilous Peaks
You can clear in any order you wish, but the recommended order minimizes gear swaps and optimizes Bane fight locations. It is strongly recommended to never clear Unhallowed Wasteland and Dark Waters last.
Fight Details
Prayers
Prayer choice is different for each Slayer area. Prayers are listed in priority order and are recommended this way to reduce the need to change them on mobile as it can be difficult given the UI.
Prayers for Bane fights will be Protect from combat style and Battleheart.
Eating Patterns
Impending Darkness Event takes more attention than 
Into the Mist. High healing food such as 
Whale (Perfect) is highly recommended. Pay attention to all attacks throughout the event, and eat to full whenever in doubt. Listed below are the high priority monsters and attacks to watch out for.
| Monster |
Attack |
Notes
|
 Rokken/Rokken Boss |
Shockwave |
Modifiers can make Rokken hurt, and a boss Rokken will be very fast. Eat to full.
|
 Ku-tul |
Curse of the Deep |
If you don't switch to god armor, modifiers + affliction can make this hit hard, since Ranged has no DR amulet. Eat to full.
|
 Greater Skeletal Dragon |
Bone Crush |
Being stunned by a Bone Crush, the -10% DR debuff from Spiked Tail Whip, affliction stacks, plus any additional modifiers makes this pretty dangerous. If you have full debuffs (stun, -10% DR), Eat to full.
|
 Spiked Red Claw |
Savage Spike |
If you're bleeding, Eat to full.
|
| Bane, Bane, Instrument of Fear |
Suffocate |
Eat at around 60% HP or earlier. You want to avoid the sleep completely.
|
| Bane, Bane, Instrument of Fear |
Fragile Mind |
If you are debuffed by Fragile Mind, Eat to full.
|
| Bane, Instrument of Fear |
Overwhelming Power |
Spam eat.
|
Area Fights
These notes are strictly for the monsters in each area. 
Fire Surge is the recommended spell. 
Anguish III and 
Surge II are not required but do provide better DPS; however, they will have to be selected every time you swap to your 
Magic set.
Bane Fights
Bane's attack style randomly rolls when he spawns. Similar to Into the Mist, you must fight him with the same combat style he is using, as he is immune to all attacks from other combat styles. If you don't want to fight with a particular style, you can run - do not stop the event as this will reset all progress - and re-clear the last slayer area to roll a new Bane spawn. Bane has the same abilities no matter his combat style.
It is suggested that the appropriate God Armour Set build is used during Bane fights.
Melee Bane
Probably the hardest style as the modifiers stack up. Just let the 
Tidal Edge do the work as you pay attention to its attacks.
In some of the modifier variations, the final Bane will require a lot of manual eating.
You are better off re-rolling its attack style by re-clearing the area rather than losing two hours of work.
Ranged Bane
Decent fight due to the 
Dragon + 
Centaur synergy adding a lot of extra damage. Nothing special, as 
Shockwave is a strong weapon.
Magic Bane
Probably the easiest style as you can use 
Incinerate for the duration of the fight for guaranteed burn and damage. You may wish to switch to any normal spell and start relying on 
Ocean Song once Bane reaches less than half HP, as the burn damage will drop off around half HP, however this is not really necessary. Alternatively, normal Magic and Ocean Song can be used for the entire fight too. Using Incinerate for the entire fight allows you to use 
Damage Reduction Potions instead of Diamond Luck as your hits are already guaranteed at 20k+ Accuracy Rating.
Slayer Helmet (Master)
Slayer Platebody (Master)
Terran God Platelegs
Terran God Boots
Terran God Gloves
Maximum Skillcape
Fighter Amulet
Fury of the Elemental Zodiacs
Hunter's Ring
Tidal Edge
Earth Layered Shield
Whetstone
Minotaur
Slayer Cowl (Master)
Slayer Leather Body (Master)
Aeris God Platelegs
Aeris God Boots
Aeris God Gloves
Deadeye Amulet
Jadestone Bolts
Slayer Wizard Hat (Master)
Slayer Wizard Robes (Master)
Glacia God Platelegs
Glacia God Boots
Glacia God Gloves
Elite Amulet of Magic
Ocean Song
Wizard's Scroll
Prayer Scroll
Witch
Terran God Helmet
Terran God Platebody
Aeris God Helmet
Aeris God Platebody
Glacia God Helmet
Glacia God Platebody
Battleheart
Protect from Ranged
Stone Skin
Protect from Melee
Protect from Magic
Cursed Lich lifesteal but is not required. 
Combat:
