L_Ender's Cataclysm guide for FTB Skies 2: Aero 1.0.3 to 1.4.1

Same as in the FTB Skies 2: Aero 1.10.0 guide

Cataclysm adds difficult dungeons, challenging boss fights and powerful items. The idea is simple: you beat the bosses to prove yourself and earn strong gear. This pack ships version 3.33 of the mod.^[1][2]

Where the quest book puts it

Both chapters that feature Cataclysm sit in the "Exploration & Combat" group. The Bounty Board is chapter 11 of 31 and has 59 quests. The Traveler's Quest is chapter 15 of 31 and has 38 quests. The sources here don't show which chapters sit right before or after them, or the order of quests inside each one.^[3][4]

• In the Bounty Board, one quest (untitled in the book, named after its item) is built around Burning Ashes. It tells you to kill Ignis's minions in the Burning Arena and gather enough Dying Ember to craft the Burning Ashes. Using them on the Altar of Fire at the top of the arena summons Ignis. See also a quest in "Bounty Board".^[3]
• Also in the Bounty Board, "Dip into the Leviathan's Fishbowl" quest covers the Leviathan fight. Before it, you must craft Abyssal Sacrifice using drops from a Deepling Warlock and a Coralssus, plus plenty of other precious resources.^[3]
• In The Traveler's Quest, a quest in "The Traveler's Quest" is another Abyssal Sacrifice quest. It combines a structure task, several kill tasks and the Abyssal Sacrifice item. The other 27 quests in that chapter are in the quest book, but their text isn't covered here, so check the book for what they ask.^[4]

Same as in the FTB Skies 2: Aero 1.10.0 guide

In this pack the mod shows up in two chapters of the "Exploration & Combat" group: Bounty Board and The Traveler's Quest. Three quests hand-in items from the mod, and they revolve around two bosses: Ignis and the Leviathan.^[3][4]

Bounty Board (chapter 11 of 31)

This chapter has 59 quests. Its intro quest, "The Bounty Board" quest, says the chapter holds repeatable quests you can complete for some extra cash to spend at the shops. Two of them involve the mod.^[3]

• a quest in "Bounty Board" asks for Burning Ashes, plus a kill task and a structure task. The quest text says you first kill Ignis's minions in the Burning Arena and gather enough Dying Ember to craft the Burning Ashes. Using them on the Altar of Fire at the top of the arena summons Ignis.^[3]
• "Dip into the Leviathan's Fishbowl" quest asks for Abyssal Sacrifice, plus a kill task and a structure task. The quest text says you must craft the Abyssal Sacrifice before fighting the Leviathan, using drops from a Deepling Warlock and a Coralssus, along with plenty of other precious resources.^[3]

The Traveler's Quest (chapter 15 of 31)

This chapter has 38 quests, all about finding structures and fighting what lives there. Two entries line up with the mod's content.^[4]

• "Discover the Burning Arena" quest has a structure task and three kill tasks. The quest text describes a coliseum floating in the Nether's void: defeat the Ignited Revenants for their smoldering ashes, then ignite the altar at the top level to face their master. It also mentions a Cinderous Soulcaller, used to wake the memory of an ancient champion at the lava-strewn base, and a key that opens the vaults around the arena.^[4]
• a quest in "The Traveler's Quest" is a quest the book gives no title of its own. It has five tasks: a structure, three kills and a hand-in of Abyssal Sacrifice. It has no description text, so the sources here do not say which structure or which mobs it wants.^[4]

The same item, Abyssal Sacrifice, is asked for in both chapters. The Bounty Board quest text is the place that explains what goes into it.^[3][4]