1.0

1.0 was the first release of Advent of Ascension, then known as "Eternal Isles". It introduced The Haven, The Abyss, Precasia, and Mysterium, as well as content for the Overworld and the Nether.

Additions
Things that were added in the 1.0 update:

Resource Systems

 * Ancient Power
 * Soul Power

Dimensions

 * The Haven
 * A floating island dimension.
 * The Abyss
 * A blood-themed dimension.
 * Precasia
 * A prehistoric dimension.
 * Mysterium
 * A mushroom-themed dimension.

Mobs

 * For The Overworld:
 * Amphibiyte
 * Black Ursa
 * Bomb Carrier
 * Bush Baby
 * Charger
 * Chimera
 * Chomper
 * Clown
 * Cyclops
 * Dark Beast
 * Everbeast
 * Faceless Runner
 * Ghost
 * Goblin
 * Hiding Fungi
 * Hill Charger
 * Hunch
 * Living Fungi
 * Mother Void Walker
 * Muckopede
 * Natura
 * Night Watcher
 * Polar Ursa
 * Rammerhead
 * Sand Golem
 * Sasquatch
 * Scrubby
 * Sea Troll
 * Shade
 * Shadow
 * Skellox
 * Snow Charger
 * Sphinx
 * Stinger
 * Tree Spirit
 * Trickster
 * Urka
 * Void Walker
 * Yeti


 * For The Nether:
 * Infernal
 * Nethengeic Beast
 * Skeletal Cowman
 * Wither Wizard


 * For The Haven:
 * Automaton
 * Halycon
 * Rainicorn
 * Seeker
 * Surveyor
 * Volar
 * Voliant


 * For The Abyss:
 * Apparition
 * Bloodsucker
 * Distorter
 * Fiend
 * Flesh Eater
 * Occulent
 * Slimer
 * Web Reaper


 * For Precasia:
 * Deinotherium
 * Diocus
 * Dyrehorn
 * Giant Snail
 * Iosaur
 * Kaiyu
 * Sabretooth
 * Spinoledon
 * Terradon
 * Tortione


 * For Mysterium:
 * Banshee
 * Eeo
 * Fungback
 * Fungik
 * Nightmare Spider
 * Phantom
 * Runic Golem
 * Spirit Guardian
 * Spirit Protector
 * Undead Troll


 * Other new mobs:
 * Little Bam

Bosses

 * Blue Guardian
 * Corallus
 * Elusive
 * Green Guardian
 * King BamBamBam
 * Nethengeic Wither
 * Red Guardian
 * Rockrider
 * Shadowlord
 * Skele-Elder
 * Skele-Hopper
 * Skeleman
 * Skelepig
 * Skeletron
 * Smash
 * Yellow Guardian