A simple mod adding a new dimension (mainly for lore/isolation,) some new blocks, and 2 new items.

The Items.

Charm of Isolation. Right click to transport oneself to Isolation. Off-hand + Right Click to return to overworld. Attack another player with this item to send them there.

Tainted Knife. Returns the target player to the overworld if stabbed in Isolation. 9 attack damage, 1.6 attack speed. Used only for lore.

The Blocks.

Pillar (+ Horizontal Variants.) (+ Isolated variant.)

Package (Mainly deco, but neat anyway.)

The Dimension.

Isolation. An empty black & white space, completely quiet and freezing. Water is black and will freeze. Foliage + Grass are white.

Recipes.

The blocks are stonecutter recipes. To get pillars, you must put a Quartz Pillar in the stonecutter. To get the Package (3), you must put a piece of Stripped Oak Wood in the stonecutter.

Side note, this mod is intended as BCSMP lore, and as such, is not entirely balanced for this reason.

silly extra side note

Knife tooltip:

"Stained by divine blood. Pierces the target, returning them to the Overworld."