Jera

''The center of Jotunheim holds a unique flower. Jera, the unmerciful Nature Jotun, is Jotunheim’s puppet master. She sees through every tree, hears every splash in every creek and feels every breeze. Entwined with the world, Jera blooms, spreading both life and death.''

Jera is a Jotun of nature and life, who fights by summoning thorny vines and unleashing poison clouds. Her namesake is the rune representing harvest, fertility and earth. She is the Jotun associated with Jotunheim and the first Jotun Thora fights, assuming you follow the order suggested by the game.

Attacks

 * Jera's basic attack is a series of powerful arm slams that cover the entire space around her in succession. She always starts with a sideways strike, followed by a diagonal strike, then a central two-handed crush, then another diagonal strike, and another sideways strike. The location of the next attack is denoted by a shadow.
 * After a while, Jera starts spawning thorny vines around the arena. They lash out at Thora if she is nearby.
 * Jera grows a white flower from her back and unleashes a massive poison cloud that covers the entire arena. The only way to avoid this is to run to one of the five blue flowers present. Otherwise, Thora will suffer severe damage over time.
 * Upon hitting approximately half health, Jera extends her roots around her, splitting the arena into five sections and limiting your possibility to maneuver. They can be temporarily removed with a power attack, but come back after a while.

Strategy
It is very important to understand the pattern of Jera's basic attack in order to take on her. Simply rolling away is not sufficient to dodge the massive strikes, so it is imperative to start running away before she prepares to smash your area.

Jera occasionally becomes stunned and a white flower is exposed in her stomach. Take this occasion to hit the flower with a power attack for immense damage. If you have the power of Thor's hammer, you can activate it just after the power attack to deal some extra damage before she ejects you. In general, power attacks work well against Jera, since she is completely stationary and lacks any means to move away from them. However, if vines are nearby, they may interrupt your power attacks.

You should kill any vines that threaten you, but do not focus on clearing them all.

Be prepared to run when Jera launches her poison cloud. Between this and her basic attack, it is often difficult to find opportunities to hit Jera.

The roots she extends in the second phase can be used to your advantage. Hitting them with a power attack makes them retract. Since roots and vines cannot be in the same place, this opens a pathway clear of vines, which can be difficult to find otherwise if the battle has been going on for a while and vines have filled the entire arena.