Offensive Spikes
Aqua Spikes - Covers you with magical water spikes. Enemies that hit you take water damage. Additional Effect: May inflict Poison on attacking enemies.
Gale Spikes - Covers you with magical wind spikes. Enemies that hit you take wind damage.
~Note: This would be comparable to the other spikes as blaze spikes is to ice/shock spikes at the moment; higher overall damage due to lack of additional effect.
Terra Spikes - Covers you with magical earth spikes. Enemies that hit you take earth damage. Additional Effect: May inflict Slow on attacking enemies.
Defensive Spells
Resonance (Thunder-based): Creates an aura that copies an opponent's offensive spell and counters with it.
~Notes: The user would still take damage; otherwise this would just be a buffed Blink because blink can absorb single-targets. Would only copy two spells, identical to blink. AoEs would be reflected in an AoE around the target, which means that you'd have to be very careful with use.
~Edited note: Would have to not affect certain spells, i.e. Death, etc, otherwise it could be potentially OP. Maybe limit it to spells players can normally cast? That would prevent Meteor/Comet Counters, etc.
Bravery (Fire-Based): Increases the attack power of one target.
~Notes: Would be affected by Accession like any other spell, making it more useful with a /SCH subjob. Would be a smaller boost based on the user's Enhancing Magic Skill but still useful.
Faith (Ice-Based): Increases the magical attack power of one target.
~Notes: Think of this as the magical version of Bravery, adding perhaps a small amount of MAB based on the user's Enhancing Magic.