The main thing here is that the Chance to Cast needs to be On Striking. Maybe you could make a two handed weapon around On Struck, though you’d need some odd effects to make it worthwhile. But a dagger? That has to be on striking, both from an actual usability perspective, as well as a flavor aspect.
I have a post that discusses charges in depth. The key here is that there are some charges that are valuable, and others that are not. Teleport charges are valuable of course, as are Decrepify charges, the only thing lacking is the number of charges. So increasing the number of charges for those two spells makes sense and increases the value of the item. Level 12 Firestorm, and especially level 10 Holy Bolt are simply worthless as charges no matter the number.
Holy Bolt is not a good spell for a charge at almost any level. If you have to have a Paladin spell, Fist of the Heavens would be better, but at level 39 that would mean level 10 FofH and that’s marginal. You’d probably be better off giving charges in Zeal (lvl 10), Vengeance (lvl 10), Charge (lvl 11), or even Conversion (lvl 16) or Sacrifice (lvl 24). Conversion is even thematic with the battlefield control of Decrepify and Teleport. Although Charge, Zeal, or Sacrifice would synergize better in damage output with Decrepify. Being a two handed axe… personally I’d like Charge charges on this weapon.
Firestorm is not a very good damage spell either, particularly at level 12. If you have to have a Druid spell, Fissure (lvl 24) would be the choice for damage output. Though that’s more caster oriented. Hurricane (lvl 10) while lower in damage adds the chill effect which might be more useful. Although the real Druid spell I’d like would be Cyclone Armor (lvl 24).
Burst of Speed would be a useful Assassin charge to get on the weapon. Or Slow Missile charges from the Amazon. Charges like those could make this a very versatile and interesting weapon to build a character around, while still fitting the flavor of “Spellsteel.”
I’d probably pick the following for charges on Spellsteel:
Level 1 Teleport (60 charges)
Level 3 Decrepify (90 charges)
Level 14 Slow Missile (180 charges)
Level 24 Cyclone Armor (100 charges)
Level 1 Battle Cry (300 charges)
Level 16 Conversion (60 charges)
Level 16 Burst of Speed (60 charges)
There, 7 spells, one from each class, suited to making this weapon flexible and useful for probably either a Barbarin, Paladin, or Sorceress, but other than the Teleport not the best at increasing clear speed. It’d be a weapon for a fun build, not a top meta.
Ethereal doesn’t really feel thematic. Maybe just change “Adds 30-50 Damage” to “Damage +30-50” (similar to Grief).
To be clear, the effect is +0.5 Vitality Per Character Level, and you want to change that to +1 Vitality Per Character Level. Maybe make it Ethereal?
Main thing here is to make Fury and Maul O-Skills. That would allow it to be used in combination with Wolfhowl or Beast by a Barbarian.
Clever replacing the Knockback with Chance to Cast Molten Boulder. Are the percent chances to cast high enough though? 4% is basically once every 25 strikes or so. Even for a Zealot that’s a lot of strikes. I’d suggest making it 10%.
I’d also suggest changing the +1 Amazon Skills, to +1 All Skills. Give the non-Amazon specific bows a little more flexibility in users.
I like it. Main thing needed though is for Crossbows to be allowed to reach 9 frames per an attack, as right now they are capped at 11 frames per attack no matter how much IAS you have.
I think making the Cold/Lightning/Fire Master O-skills is really all you need to do. Leave the +3 Sorceress Skill instead of making it All Skills, it will still be incredibly useful for a Fire Druid. No need for more Faster Cast rate either.
Would allow for stacking with Ice to get level 30 Holy Freeze Aura. I don’t think that would be a good idea. How about just giving +1 Holy Freeze as an O-skill? I mean, if you go all out and stack as much +skills as possible you still can’t get higher than level 16ish Holy Freeze anyway, (remember Charms + skills are Paladin only), and it won’t stack with Ice Holy Freeze Aura.