World Breaker

The World Breaker is a tool added by Avaritia. As the tooltip notes, it is auto-equipted with Fortune X. The World Breaker does not use durability, and can mine Bedrock.

Shift right-clicking with the World Breaker will put it into "hammer" mode, and shift right-clicking again will put it back into normal mode. Breaking a block with hammer mode active will destroy all blocks in an 8x8 cube. Instead of dropping all of those items, one Matter Cluster will be dropped with all of the items inside of it (this is likely done to avoid lag).