Is there an existing issue for this?

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Observed behaviour

I was playing with the following items equipped:

• Full set of diamond armor
• Fully upgraded Spell Blade in main hand (no wand upgrades)
• Novice level Wand in off-hand (no spells assigned, hadn't gotten enough crystal silver nuggets for a runic shield).

1. I was able to do full damage and cast spells with the Spell Blade
2. When performing a basic attack (if it's set cost mana) or casting a spell with a Spell Blade, the mana comes from the Spell Blade and not the Wand.
3. When the mana on the Spell Blade reaches 0, the Spell Blade vanishes.
4. The Spell Blade did not appear to have any elemental powers (this is normal for not wearing a full set of matching elemental Battlemage armor)

Expected behaviour

I would have expected the following:

1. Without Battlemage armor, the Spell Blade would do half damage and I could not use it to cast spells.
2. With a off-hand mana source (such as a Wand), any basic attacks from the Spell Blade or casting spells with it would use mana from the off-hand source.
3. When the Spell Blade's mana reaches 0, I would expect Spell Blade to remain in the main hand.
4. When no mana remained in either the Spell Blade or the off-hand mana source, I would expect the damage to be reduced by half.

I do like the idea that the Spell Blade is not used as a source of mana and instead uses a runic shield or mana-source from the off-hand.

Steps to reproduce

1. Join a Server
2. Equip a full set of Diamond armor, Spell Blade in main hand, and Wand in off-hand
3. Use up the Spell Blade's mana and notice the Spell Blade disappear.

Crashlog

No response

Environment (Singleplayer/Server, etc.)

Issue present on both sides

Mod version

1.6.0

Forge version

1.12.2-forge-14.23.5.2860

Other mods

No response