I can't beat the shrine queen is there a item that stops the effect from..

In order to beat Selkis Keep your party all next to each other Use Delma and Camelia for healing and use Volk , Darc and Bebedora to attack. On the First turn use Heated Soul on your party to raise their attack. Now the goal is to take out all of the worms. Don't near Selkis herself yet. The Main strategy is to grup everyone up on a worm and attack if their health gets low use Healing Rain also use bebbadora's Mind Control on some of the Coleopt if you take control you will get extra attack forces. When all four Worms are gone it is time to go after selkis keep distance from her use your magic because if you get too close she will use powerful attacks on you just keep using magic and wear her health down. If there are still coleopt guarding her stand back and let them come to you then use physical attacks against them but save your magic for Selkis.