Mundus

Mundus is a boss in Mission 19 and has two phases. First phase is breaking his arms then his core. Players usually lose massive amount of time at this segement due to:

Failing 1 cycle per arm - original game only
Bad RNG - this applies to both versions but hurts the most in Definitve Edition
Constantly receiving Lava Breath pattern instead of anything that allows player to attack Mundus
This fight is much more punishing in the Original game because Demon Evade is a must, while Definitve Edition can just avoid with jumps then counter attack for each pattern.

Changes to the original game

Reworked the camera system completely, using only the Mundus specific chase camera for the entire fight.
Mundus SOS mode global balance is now 3.0x Devil Hunter mode balance (up from 2.0x)
Mundus DMD mode global balance is now 5.0x Devil Hunter mode balance (up from 3.0x)
Reworked the two-handed slam attack, normalising the damage (max damage is now 900 damage, whereas this could kill you occasionally on DMD mode) and making the two explosions mutually exclusive.
Mundus now has a lot more health across the board, on both arms and the final stage. This is scaled correctly by difficulty.
Dante is now able to evade the two-handed slam attack.
Removed the damage from the left-arm fireball explosion.
Made the damage from the fireball scalable by difficulty.
Increased the damage of the fireball significantly (600 damage on DMD).
Significantly increased speed of Mundus's fireballs.
Doubled the damage from successfully parrying a fireball.
Moved the Angel Lift point activation to much earlier in the goop sweep attacks (allowing the player to leave the roof as soon as they realise he's performing that attack).
Completely reworked Mundus's targeting system making it more accurate but also more forgiving.
Completely redesigned the way Mundus targets with the triple slam attack.
Rebalanced the triple slam attack to deal less damage globally. It's also more forgiving allowing you to avoid subsequent hits if you're hit with the first/second strike.
Rebalanced the timing of the left/right slam attacks, making them more forgiving.
Fixed various issues where evades weren't valid and/or the i-frames from being hit were being ignored by follow up attacks.
Changed the targeting system so that Mundus is guaranteed to return to his original position at the end of an attack (stops bugs involving Mundus being out of position).
Reworked the end sequence so that Mundus fires a single fireball, then two, then three and so on (between exposing his mouth). On Human/Devil Hunter the maximum number of fireballs is 1. On Nephilim it's 2. On SOS it's 3. On DMD it's 6.

Strategy

The arms will do several different types of attacks that often stay on top of the building giving you a chance to damage them. Definitve Edition can break them with DT Judgement spam. Original game must use Demon Evade before DT Judgement because his health pool in that version is much larger. As a result, the timing of each cycle is much more stricter.

Smash Barrage - This happens a lot in the Original game. Three smashes in a row with his fists. Gives a good opportunity to prepare Demon Evade. But, it has no counter play and considered bad RNG.
Two-Hand Smash - This is a good RNG which brings both of his fists down. Demon Evade → Judgement for whichever arm has the most health.
Lava Flow Attack - This is hard attack to Demon Evade because it brings a wave of lava so, the player must reach to the spot where Dante can evade without getting hit by the lava shockwave before Judgement spam.
Meteor Shot - This also happens a lot in the Original game. Mundus will rear back a fist and shoot a Meteor at Dante. Possible to deflect for the damage boost but still not a good RNG.
In phase 2, the armless body will exclusively do Meteor Rain followed up by screaming at Dante. When Mundus decides to scream it takes only two attacks to finish him off. However, it's faster to deflect the meteors instead.

When Mundus performs Lava Breath. Fall off from the ledge to force him into a different pattern. If you do it too fast then he will keep doing the same pattern. Very common in phase 2.

Deflecting Meteor Rain is a lot harder in the Original game because it requires 2 out of 3 meteors compared to Definitve Edition which is only once. Most reliable way to do it is 1 Reb strike into Osiris Feed.

Video Demonstration

Original game demo

Definitve Edition demo

It's good to check the Frequently Asked Questions (FAQ) if you have general questions regarding the bosses.

Mundus

HP Values
1,000 ^×3
Difficulty scales the defence

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Mundus

Strategy

Video Demonstration