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.