Viking Raid Bonanza

Symbols in winning combinations highlight their tiles. If the special trigger symbol is present on the grid at the end of the tumble all symbols on highlighted tiles are replaced with shields, coming in 3 types:

Regular shields – they reveal a multiplier. This sum of all shield multipliers is applied to the total tumble win for the spin.
X shields – reveals a multiplier which multiplies the multi of all regular shields on the screen, before they are applied to the total tumble win for the spin.
Collector shields – collects the multipliers from all shields on the grid and new shields spawn in their place. Then they reveal new rewards.