SSR gear item Crown of Jörmungandr's effect is mainly concerned with dealing double attack damage to the enemy, and it is mainly worn by Mages and Priests. Let's take a look at the advantages and strategies of this item with regards to some of the game's most popular heroes.
Merlin: At max stars, Merlin's Ultimate has the force of a nuclear bomb, but due to her low speed, she doesn't often get the chance to use it. However, with Crown of Jörmungandr, as long as Merlin is attacked and reduced to 80% HP, she gains an additional chance to take action, and can unleash her full power.
Freya: If your enemy is wearing Crown of Jörmungandr when Freya attacks them while she’s wearing Tears of the Nile, the enemy’s Crown of Jörmungandr will take effect. It's best if you silence them to suppress the trigger effect. When the enemy's Freya has finished taking action, and your Freya's HP has been reduced to 80% by another enemy hero, she can use her Ultimate again, not only dealing damage, but also silencing the enemy Freya twice.
Hestia: When Hestia wears Crown of Jörmungandr and is taken down to 80% HP, she will immediately gain Crown of Jörmungandr's effect and take an extra action, healing your team completely and dispelling all debuffs! Your team won't have to fear silence, and even over-healing has its benefits with Hestia! She'll also ensure that your team blocks for 2 turns.