new gloomy block for the dark city.

it is a block with unique characteristics they are like branches covered by something gelatinous. These branches, being covered 100% by the gelatinous substance, will make you bounce off the walls. when the damage of the gelatinous layer is at 75% you can prick yourself with the thorns. When the gelatin layer damage is 25% or less. the block may disappear. Special: sculk catalyst regenerates the gelatinous layer. This shadow block is damaged on contact by some entities such as the player.