Liquid Etherium is a water-like substance that can rarely be found in plains and plains-like environments. For the most part, it acts exactly like water would, though it cannot be used to waterlog blocks, create bubble columns or other, rather exotic appliances. Also, it does not create sources or trickle down from dripstones.
Liquid Etherium Bucketarsmagicalegacy:liquid_etherium_bucketLiquid Etherium can be processed in an Obelisk to create neutral Etherium. One bucket of Liquid Etherium is worth 1000 Etherium (or 10 units of vinteum).
Bathing in Liquid Etherium grants the Mana Regeneration effect.
And as you should know by now, placing a book in a nearby item frame yields a copy of the very book you are reading this in.