As an Int build, Necromancer might be a better Title choice. It comes with status potency, Spellcaster lean for increased spell damage, Int drive, several mana regen options and a powerful dark nuke in Grand Haunting.
Caecus comes back in about a month, so keep an eye out for that Pyro Bloodblade.
Keyote returns to the Void next week, so it might be a good idea to grab Blade of Briar. The skill does high damage when paired with Vamp's Evolved form, and Bleed heals hp from Drink passive.
Thunder Lord's Staff toggles to autohit. Returns in early December.
There are two interesting options for a light weapon. Mystic Retro Golden Axe restores mp and sp when you cast a light spell. Lion's Roar gives your light spells +22.5% damage, or a whooping 37.5% against undead.
Blackbones would boost the damage of Necro's Grand Haunting.
As mentioned above, I highly recommend switching your title and training the Necromancer class.
Unfortunately, that locks out all the fun skills on Holy Armor, so Retro Golden Plate (+12.5% spell boost) might be a better option.
If you grab Blade of Briar, Psionic Vampire variant might be worth trying out.
Log in next Monday for a chance to get the best wind mage shield in the game.
Serenia's Benediction (Harvest Fest) restores a bit of mp each time you're hit.
Mystic Father Time should return sometime around New Year.
Mana Crystal Defender creates a small Barrier each time you cast a spell.
Unfortunately, Dragonlord's Will now scales off Str and doesn't interact with Gandolphin, so some other option might be preferable.
Glimpse of the Mountain has a high chance of Petrifying the monster, so it works nicely with Dragonlord's nuke. (though most bosses are immune, or at least highly resistant to stun effects, so keep that in mind)
Knife to Meat You is a qc damage earth spell. Usable 1/battle.
If you decide to invest in End, Your Soul Burns Bright as a Beacon is a light spell that costs hp instead of mp (and old standard hp cost at that, which is pretty negligible). Uses End for stats.
Spotter Drake gives Status Potency.
If you decide to go for Blade of Briar, Scarab's Bleed Potency might come in handy.
If you ever find yourself with a spare UR GGB, Prime Chaos Orb is an exceptional misc to have. It comes with a qc skill to scramble monster resists, which allows you to mak best use of all those elecomped armor skills.
Brainwreck is an ok misc. Once per battle it can heal 198 sp, and that can come in handy here and there.
Hopefully this helps, and don't hesitate to ask if you have any questions!