Tough Enemies

Tough enemies need not be so difficult to defeat if you use some indirect magic spells to hinder their attacks.

Behemoth
    Cast Berserk to stop the Behemoth from using its Meteor attack, which can finish off your party if you're not careful.  To reduce the effectiveness of its physical attacks, cast Blind on the Behemoth, rendering it harmless.

Elnoyle
    A Pain spell will weaken Elnoyles fast.  However, there is a catch.  If you cast a Pain spell from your magic stocks, it will miss.  If you Draw Cast Pain on the Elnoyle it will miss as well.  Cast Reflect on your party members.  When the Elnoyle casts Pain on one of your party, it will reflect off that character onto the Elnoyle and will not miss.

T-Rexaur
    T-Rexaurs rely on physical attacks to wear your party down.  Cast Blind on the T-Rexaur and it will not be able to hit you accurately.