Gunilla is a paid to play hero which requires you to make a purchase.
Gold Attributes:
Hero ATK up by 20%
Increase Cavalry HP by 50%
Increase Cavalry ATK by 30%
Increase Army DEF by 25%
Collecting Shards:
You need to purchase multiple packs to upgrade this hero.
Note: Gunilla is a very handy Cavalry focused hero for those type of
players who use Cavalry set ups to attack.