The Watcher now spawns one of Sadan's four Giants in the Blood Room in addition to its other Undeads. The Giants have 50% chance to drop their respective Precursor Relics on death. This mechanic is the basis of "Frag Running" which involves rushing the blood room (preferably with a variation of Necron's Blade), killing the Giant and selling the loot.
All movement abilities and items such as Aspect of the End and Ender Pearl are disabled in the boss fight. Spirit Leaps, Bonzo's Staff and Jerry-chine Gun are still allowed. When trying to use blocked items, a chat of "A mystical force stopped you from using this item!" appears.
The amount of Catacombs XP and quality of Dungeon Post-Boss Chests are increased depending on which stage in the boss fight the player passes.
Regardless of score, beating each phase unlocks 1 chest, and if the run is completed, the Obsidian Chest is unlocked as well.
Master Mode Floor VII adds a new phase to the Floor VII boss fight called Phase 5, where the players fight against the Wither King. By picking up five different orbs and placing them in cauldrons close to the Wither King, the Wither King's Dragons called: Apex Dragon, Power Dragon, Flame Dragon, Ice Dragon and Soul Dragon will be summoned. The players will have to kill them near their corresponding dragon statues to destroy them. All dragons can respawn at any time indefinitely until all dragon statues are destroyed. If all destroyed, the floor is completed. If all five dragons are alive within at least ten seconds at any time, the Wither King will send the players into the air in the center of a ritual. The dragons will complete the ritual and summon a large hand that grabs the players, causing them to fail the dungeon run and be brought down to the regular Floor 7 ending, where they will still get a Bedrock, Obsidian and Emerald chest but will get a B or C score. Achieving S+ score also unlocks higher chance of getting RNG drops.
Shiny Wither Armor[]
When dropped from the Master Mode chests, Wither Armor now has a chance to be Shiny Dungeon Armor. It is functionally the same as regular Wither Armor.
After each completed dungeon run in The Catacombs - Floor I and above the player is presented with Dungeon Reward Chests depending on how well they did. Listed here are the rewards from each chest:
When the floor first released the 3rd phase of the fight was glitched and it could not be completed.
If you lure Storm into the red pad, the fight will soft lock as this is a bugged chunk.
When Master Mode Floor VII released, Shiny Wither Armor had the same scaling mechanic as Dungeon Mob drops, adding up to a +50% stat boost and upgrading its base rarity in the case of a perfect stat boost.