Bayonetta slows time down to fill a Climax Gauge to summon Gomorrah to devour her opponents. Gomorrah retains its elephant-like roar from the Bayonetta games.
Bayonetta yells "Smashing!" ("Showtime!" in the Japanese version, when using her Bayonetta 2 outfit) before activating the effect of Witch Time across the entire stage, slowing all opponents to 0.25x speed for 7 seconds; Bayonetta also has 0.6x gravity and 0.8x falling speed during this time. A Climax Gauge then appears at the bottom of the screen, and Bayonetta must attack opponents to fill the gauge before Witch Time's effect runs out. After it is full, she must hit another fighter with an attack that deals knockback (her Bullet Arts will not work). Once this occurs, Bayonetta yells "Avavago!" and creates a portal, summoning the demon Gomorrah, who attacks the most recent three fighters being affected by hitstun from one of Bayonetta's attacks the moment it is summoned (regardless of whether it was from the final hit or not). Gomorrah's attack deals 30% damage, and while it is chewing another gauge appears: if the said gauge is filled by mashing either attack button, an extra 15% is done to the targets. If any target's damage reaches 100% or more by Gomorrah, they are instantly KO'd at the end of the attack; otherwise, they receive a moderate amount of knockback, behaving similarly to the Danger Zones in The Great Cave Offensive and Master Fortress.
Teammates will also be affected by the Witch Time's slowdown, but their attacks on opponents will contribute to filling the Climax Gauge. However, once it's full, Bayonetta herself must deal the last blow in order to summon Gomorrah.
Before her Final Smash, Bayonetta encounters Witch Time, during which she can attack the enemy to fill her magic gauge. If it fills up, she summons the demon Gomorrah, who chomps down on the unfortunate foe! Keep pressing the button during Gomorrah's attack to increase damage. If it hits 100% the enemy will be instantly KO'd!
Infernal Climax is based off of Bayonetta's main way of finishing off large opponents. The Climax Gauge is modeled after the one seen in Bayonetta 2, where it fills up for button prompts and quick time events (QTEs) rather than the damage she deals as in Super Smash Bros. 4. The Megaton/Gigaton/Infiniton score system used in the Bayonetta series is also absent. She also says "Smashing", like she randomly does in Bayonetta 2 while performing a combo.
Gomorrah, Devourer of the Divine, is one of Bayonetta's Infernal Demons who appears as colossal, demonic dragon-like reptilian beast. It is used to finish off large enemies throughout the series, with only its head ever being shown. Gomorrah attacks by biting, gnawing, and devouring any enemy it is set upon. It was her go-to option for dealing with most enemies in the first game, but in Bayonetta 2, Gomorrah breaks free from her control and fights her atop a skyscraper. It is its betrayal that causes Jeanne to lose her soul, and the start of Bayonetta's journey to save it. After the defeat of Aesir, the God of Chaos, Gomorrah would return to being one of Bayonetta's loyal demons once again, his betrayal being a result of Aesir's influence.
To keep the E10+ rating, her clothing stays on during the attack, as opposed to in her origin games where all of her clothes disappear, aside from hair that is around her body, her gloves, and her heels. This is because her clothing is her hair.