FTB Ocean Mobs guide for FTB Evolution 2 1.2.0 to 1.3.0

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FTB Ocean Mobs guide for FTB Evolution 2

Written for FTB Evolution 2 1.2.1 · also fits 1.2.0 to 1.3.0 · updated Oct 17, 2026

Last verified for FTB Evolution 2 v1.2.1 on Oct 17, 2026 · text last changed Oct 17, 2026

A newer release (1.4.0) is out Guide for the current version

Also applies to:FTB StoneBlock 4 1.22.0 to 1.23.0

Sections
5
Items named
4

1 section is written for this pack; 4 are shared from another pack's guide.

Every recipe and number here was checked against FTB Evolution 2 1.2.1's own files.

What is FTB Ocean Mobs?

Same as in the FTB StoneBlock 4 1.22.0 guide

This pack ships FTB Ocean Mobs at version 21.1.4, using the file ftboceanmobs-21.1.4.jar. It is part of the mod list in version 1.22.0.[1]

It isn't new either. The pack's mod list shows it was first included in version 1.0.0 or earlier, so it has been part of the pack since the early releases.[1]

Unverified What FTB Ocean Mobs adds in game (its mobs, their behavior and any settings) could not be confirmed from the material available for this guide, so none of that is described here.

How do you get started with FTB Ocean Mobs?

2 parts

Same as in the FTB StoneBlock 4 1.22.0 guide

There isn't a crafting-first path for this mod that I can confirm, so this section stays short. What I can tell you is what the mod adds, and the one setting this pack gives it.[2]

What the mod adds

FTB Ocean Mobs brings in a group of new mobs: the Abyssal Sludge, Abyssal Winged, Corrosive Craig, Mossback Goliath, Rift Demon, Rift Minotaur, Riftling Observer, Shadow Beast, Sludgeling and Tentacled Horror, plus a boss called The Rift Weaver.[2][3]

It also adds a few items and blocks. You'll see the Sludge Ball and the Abyssal Water Bucket, a spawn egg for each mob, and the blocks Abyssal Water, Energy Geyser and Sludge Block. There is also an enchantment called Rift Disruptor and an effect called Drowning Shadows. The language file only gives their names, so I can't tell you what they do.[2]

The one pack setting to know

The Rift Weaver boss fights inside an arena, and rift_weaver_arena_size controls how far horizontally the boss will roam from its start position. This pack sets it to 48, which is the same as the mod default. The allowed range is 16 to 128.[3]

Unverified No in-pack recipes for this mod's items were found in the sources, so there is no confirmed order of items to craft first.

How does FTB Ocean Mobs work?

5 parts

Same as in the FTB Evolution 2 1.1.0 guide

FTB Ocean Mobs is a mob mod, so there are no power, fluid or item-handling systems to wire up. The sources here confirm a handful of mechanics, and this section covers those.[4]

Rift mobs

The mod groups its creatures in a Rift mobs entity tag: Riftling Observer, Abyssal Winged, Corrosive Craig, Mossback Goliath, Abyssal Sludge, Shadow Beast, Rift Minotaur, Tentacled Horror, Rift Demon, The Rift Weaver and Sludgeling. Each one has its own spawn egg item.[4][5]

The Rift Weaver arena

The Rift Weaver is the boss in this list. How far it roams horizontally from its start position is controlled by rift_weaver_arena_size. The pack sets it to 48, which is also the mod default, and the allowed range is 16 to 128.[6]

Drowning Shadows

The mod adds a Drowning Shadows effect. It also ships a block tag named drowning_shadows_cure, which contains Sponge and Wet Sponge.[4][7]

Seismic block tags

Three block tags in the mod have seismic in their names. The sources show only their contents, not how the mod uses them.[8][9][10]

  • seismic_smashable: sandstone, crimson planks, blackstone, cobbled deepslate, deepslate bricks and everything in the c:glass_blocks tag.[9]
  • seismic_smashed: red sand, sand and gravel.[10]
  • seismic_cracked: crimson slabs, crimson stairs, blackstone slabs, cracked deepslate bricks and cracked deepslate tiles.[8]

Sludge items

Sludge Block drops itself when broken, and it still drops if it is caught in an explosion.[11]

The pack adds Sludge Ball to both the c:slimeballs and c:slime_balls item tags. Recipes that accept slimeballs through those tags will therefore take it.[12]

How do you progress through FTB Ocean Mobs?

1 part

This one is a short section, and I'd rather tell you that straight than invent a tier ladder. For FTB Ocean Mobs, the sources I have show data tags and a block loot table, but nothing that lays out stages of progression.[5][11]

Unverified Quest steps and crafting recipes for this mod's items would live in the pack's quest book and recipe data. The sources here show neither, so there is no confirmed tier order or unlock path to describe.

What the mod's data does show

The mod groups its creatures in a rift mobs entity tag. It lists the riftling observer, abyssal winged, corrosive craig, mossback goliath, abyssal sludge, shadow beast, rift minotaur, tentacled horror, rift demon, rift weaver and sludgeling.[5]

  • The sludge block, Sludge Block, drops itself when broken, as its loot table has a single entry for the same block.[11]
  • The mod's drowning shadows cure tag contains Sponge and Wet Sponge.[7]
  • The seismic tags name blocks the mod treats specially. Sandstone, crimson planks, blackstone, cobbled deepslate, deepslate bricks and any glass block are in the smashable tag.[9]
  • Sand, red sand and gravel are in the smashed tag.[10]
  • Crimson slabs, crimson stairs, blackstone slabs, cracked deepslate bricks and cracked deepslate tiles are in the cracked tag.[8]
Tip: The tag files only list which blocks and mobs belong to each group. They do not tell you how or when the mod uses them in play, so check that in your own world before relying on it.[5][7][8][9][10]

Which FTB Ocean Mobs config options matter?

1 part

Same as in the FTB StoneBlock 4 1.22.0 guide

There is only one config option for this mod in the pack's common config file, and it controls the Rift Weaver boss fight. It is the one to know if you plan to take that boss on.[3]

Rift Weaver arena size

rift_weaver_arena_size sets how far horizontally the Rift Weaver boss will roam from its start position. In other words, it is the size of the boss arena. This pack sets it to 48, which is the same as the mod default, so the pack has not changed it. The allowed range is 16 to 128.[3]

Tip: A larger value lets the boss roam further from where it starts, and a smaller one keeps it closer. If you edit the value, stay inside the 16 to 128 range the option allows.[3]

Sources

  1. FTB StoneBlock 4 1.22.0 mod list · pack file
  2. ftboceanmobs names, screen text and descriptions (English lang file) · official mod data
  3. FTB StoneBlock 4 1.22.0 config: config/ftboceanmobs-common.toml · pack file
  4. ftboceanmobs names, screen text and descriptions (English lang file) · official mod data
  5. data/ftboceanmobs/tags/entity_type/rift_mobs.json (ftboceanmobs's jar) · official mod data
  6. FTB Evolution 2 1.1.0 config: config/ftboceanmobs-common.toml · pack file
  7. data/ftboceanmobs/tags/block/drowning_shadows_cure.json (ftboceanmobs's jar) · official mod data
  8. data/ftboceanmobs/tags/block/seismic_cracked.json (ftboceanmobs's jar) · official mod data
  9. data/ftboceanmobs/tags/block/seismic_smashable.json (ftboceanmobs's jar) · official mod data
  10. data/ftboceanmobs/tags/block/seismic_smashed.json (ftboceanmobs's jar) · official mod data
  11. data/ftboceanmobs/loot_table/blocks/sludge_block.json (ftboceanmobs's jar) · official mod data
  12. kubejs/server_scripts/tags/item.js (FTB Evolution 2's own script) · pack file
Where this guide comes from

Written from what FTB Evolution 2 itself ships: its files and recipes, the in-game guidebooks and the mods' own pages. Every statement links to the source it came from, and the numbers are checked against the pack before publishing.

Guide last verified Oct 17, 2026.

Guides for other versions: 1.3.1 to 1.4.0 · 1.0.2 to 1.1.0

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