Element galaxy is an add on for the upcoming Galacticraft and already made thrum craft 3. It contains Humanoid beings named clerics which are wizards. They have staffs which can shoot out 1 out of 12 elements in the game. There are things called Alchemy dens, which you can find lots of magical riches in the game. There are new planets which you can travel to, like(in alphabetical order)
And these are the new elements: Balanced, Dark, Ice, Life, Light, Myth, Psychic and Water. The elements Fire, Lightning, Earth and Air are already in tc3.
And planets have different elemental clerics on them. Example
And there are new mobs
Zombie cleric(drops damaged staff and rotten flesh)
Mummy(drops paper and/or lapis)