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Why Clear Infernal Stronghold?
There are three main uses for 
Infernal Stronghold:
Manual-Eating Build
The following build is for the players who just finished the 
Volcanic Cave and the subsequent 
Ancient Claw grind.
Without manual eating, the main cause of death for the build below is 
Malcs's combo of Sealing (Stun) + Penetrating Claws.
It is heavily advised to use either the Ancient Claw or at the very least 
Sunset Rapier because you want to get out of stun quickly, and the faster your attack speed is, the faster you will do it.
You might want to use prayers to increase your accuracy. Without the prayers, your hit chance against Malcs will likely be around 25%. With them, it's around 40%.
If you have 
Diamond Luck Potions, it might be the right occasion to use them.
Getting the 
Infernal Cape after the first clear should make it a bit easier to clear it for the next 9 times if you aim for the 
Infernal Claw.
Optionally, it is advised to get the 
DFS, preferably with 
Icicle Volley and 
Witch because it oneshots 
Green Dragons or with 20k-accuracy 
Slicing Winds otherwise. DFS will increase the margin of error that you can make when fighting Malcs's.
You also can swap the 
Sandstorm Ring for the 
Silver Diamond Ring if you don't have enough DR to be comfortable, but it will drastically reduce your clear speed.
Malcs's Combos
To attempt Infernal Stronghold, it is heavily advised to have the AutoEat threshold above all Malcs's moves when you're not stunned. The build above can do that with 900 HP, although it is advised to check it with the Combat Simulator if you're not sure. As additional info, with DFS and 990 total HP, you definitely can do it like that.
Otherwise, you would need to keep track of many moves, which will likely lead to death and lost gear that needs hundreds of hours to get again.
Check your thresholds in the first fight just in case.
You will need to manually eat when Malcs uses Sealing:
- Sealing + Penetrating Claws: It will be your cause of death if you underestimate it. Be aware that the Spam Eating kicks in with a delay after you push a keyboard button, so press it before the Penetrating Claws hit you. Also, the two instances of damage are separated by less than half a second, so use Spam Eating to be on the safe side. Calculate the damage from Penetrating Claws by [math]\displaystyle{ 640 \times (1-\text{DR}) \times 1.3 \times 2 }[/math].
- Sealing + Tail Whip: Heal to full HP. If you have time, look what the max damage of the Tail Whip is when you are stunned, so you can refrain from manual eating when your HP allows it. Or you can calculate it before the fight by [math]\displaystyle{ 690 \times (1-\text{DR}) \times 1.3 }[/math].
- Sealing + Usual Attack: Happens when Malcs uses another Sealing after the first one. Use the same logic as with Tail Whip.
- Sealing + Inferno: A "Get Out of Jail Free" card. You don't need to manually eat at all.
AFK Options
For those with 
Level 90 who have completed their Dragonfire Shield, consumable resources can provide enough additional DR to push the build above into something that can survive purely by Auto-Eating, as long as none of them run out.
Requirements
Prayer Scrolls or 
Alchemist's Bags can be used to reduce total prayer point costs or number of potions needed to survive 10 Infernal Stronghold runs, respectively.
If one has cleared 
Air God Dungeon a handful of times, 
Aeris God Gloves and 
Aeris God Boots can be used instead for an additional 2% DR each. Similarly, after your first clear of Infernal Stronghold, swapping to your newly acquired Infernal Cape will net another 2% DR. Combined with +1% DR from 
Lake Swim that's enough to swap your helmet for a 
Chapeau Noir for a reoccuring 10% chance to need one less run.
Agility
Bonuses from Agility Obstacles can reduce the amount of DR required considerably by increasing your Maximum Hitpoints.
Requirements
Level 20
Level 70
Level 20
Level 20
Level 60
Level 60
Level 80- Level 80
For instance, assuming the same Level 90 as before, after these HP bonuses, the DR required to AFK has dropped to only 54%. If you're lucky enough to have 
Finn, the Cat, hitting only Level 91 for a total of 1060 HP would let you drop as far as 53%, eliminating the need for either DR potions, or Prayers and Witch Summoning Tablets, or when combined with the equipment improvements mentioned above, both. Or used with everything above to lower minimum HP to Level 76, though using Cliff Balance and prayers together is costly.
After Water God Dungeon
With access to magic armor with late-game DRs, you can now take on this dungeon with proper Combat Triangle advantage, meaning no need for expendable resources besides food and runes, no need for agility boosts, and even still enough DR to spare some for item doubling.
Instead of the 
Ring of Wealth, a 
Aorpheat's Signet Ring can be used; it will give you an additional 100k-150K GP per clear, but only a 5% chance to double Infernal Core drops, making it worse for those farming only 
Infernal Cores but better for those also farming GP.
For those who have already acquired their Infernal Claw, thus exclusively interested in GP, please see the Combat section of the Money-Making Guide.
Dragon Claw and 
(G) Ancient Helmet
(G) Ancient Platebody
(G) Ancient Platelegs
(G) Dragon Boots
(U) Ancient D-hide Vambraces
Fire Cape
Elite Amulet of Defence
Sandstorm Ring
Ancient Claw
(G) Ancient Shield
Level 80
Level 90 with 
Level 50 Damage Reduction Potion
Level 65 with 
Witch level 4 and 
Yak level 3.
Silver Diamond Ring
Dragonfire Shield
Yak
Safeguard
Stone Skin
Chapeau Noir
Glacia God Platebody
Glacia God Platelegs
Glacia God Boots
Glacia God Gloves
Skull Cape
Ring of Wealth
Fire Imbued Wand
Scaled Shield
Combat:
