The Brooch is a destructible element that cannot be linked. It’s usually 4 times bigger than Charms (2x2 size of Charm) and can have up to 8 “layers” of Pearls around it.
Every time you make a link next to it or hit it with a Blast, the Brooch loses 1 Pearl.
When all the Pearls are cleared, the Brooch explodes and wipes the whole board.