Free spins
During the free spins phase, the shield scatter helps power up your Wilds. You'll see a counter above the reels tracking the shields you collect. Once you hit four, the sword doubles in size; at eight, it triples; and at twelve shields, it transforms into a massive expanding wild.expanding wild.
The momentum keeps building during free spins: every time a new sword appears or an existing one shifts position, you're granted an extra free spin.