A question my player asked "Can an Evocation Wizard Sculpts Spells with a Wand of Fireball?"

"Sculpt Spell: When you cast an evocation spell that affects other creatures that you can see, you can choose a number of them equal to 1 + the spell's level. The chosen creatures automatically succeed on their saving throws against the spell, and they take no damage if they would normally take half damage on a successful save."

My ruling would be, Yes! Wondering what other Sage Advisers out there might think.

I would have to agree, Arcanavore. The language there works out, as the wand explicitly mentions casting the spell with the wand.

And since it's still you who's casting it, even if only through the aid of the wand, I would permit it.

Would an Eldritch Knight be able to use this?

Good question. Probably depends on the DM. They might say it has to be a true caster and not part of the subclass since most subclasses can cast spells.

When it says "spellcaster" does that mean that only magic classes can use it?

Classes and subclasses with the “Spellcaster” feature can use this. Druids, Paladins, and Eldritch Knight Fighters would all be viable.

What would happen if this were to snap?

That's probably up to you! You could just have it dissolve into ashes as mentioned in the item description. Or it explodes with the same effects as the spell - possibly increasing the damage depending on the number of charges remaining when it breaks.

Ok. I just made it snap, no magical effect. One of my players was mad, as this item was once his, but was stolen by a not-very-intellingent thief, who saw it as just a normal stick, and broke it in half. So they proceeded to try and beat him to death. He escaped. And then the player started saying that the entire party should've taken 60d6 damage or something ridiculous. But thanks!

This looks cool I think I will use it I think if you are the creator of dnd beyond you did a good job if you are not you still did a good job

The definition of a spellcaster is a character who can cast spells using at least one of their character features. Races that get spells simply for being that race thus are always spellcasters.

Contrast the Eldritch Adept feat from TCoE that requires the Spellcasting or Pact Magic features. These are exclusive to classes that use actual spell slots rather than provide spells through other means, like Path of the Totem Barbarians or Way of the Four Elements Monks.

When you make use of a wand, you cause a charge to be used.  Properly speaking, the *wand* casts the spell, not you.  It would not benefit from any abilities of the person holding it.  It might be more fun that way, but it was probably not the intent, and the rules are fairly clear about this, so talk to your DM and see what they say.

Quote from Arcanavore >>

A question my player asked "Can an Evocation Wizard Sculpts Spells with a Wand of Fireball?"

"Sculpt Spell: When you cast an evocation spell that affects other creatures that you can see, you can choose a number of them equal to 1 + the spell's level. The chosen creatures automatically succeed on their saving throws against the spell, and they take no damage if they would normally take half damage on a successful save."

My ruling would be, Yes! Wondering what other Sage Advisers out there might think.

 

 Yes.  Sculpt Spells doesn't specify that it has to be a wizard spell.  You can use it when you cast an evocation spell unlocked through another class's Spellcasting feature, such as Artillerist or Fiend Warlock.  It just says that the spell must be from the Evocation school, so of course you can apply it here.    

FIREBALL SPAM!!!

As a DM, since the spell DC is locked into DC15, I would not allow the spell to be modified by the caster.  DC15 seems to imply that the magic item creator had a fixed level of skill.

Quote from Arcanavore >>

A question my player asked "Can an Evocation Wizard Sculpts Spells with a Wand of Fireball?"

"Sculpt Spell: When you cast an evocation spell that affects other creatures that you can see, you can choose a number of them equal to 1 + the spell's level. The chosen creatures automatically succeed on their saving throws against the spell, and they take no damage if they would normally take half damage on a successful save."

My ruling would be, Yes! Wondering what other Sage Advisers out there might think.

 

This is actually a point that could use more clarity in the item description since it could be seen both ways since it says both, that the spell is cast from the wand and that you cast the spell. So the RAW is confusing on this matter, if you take the former statement then RAW is no but if you take the latter statement then RAW is yes.

I would say that with both statements, RAW and RAI is yes, for the following reason, the former statement is only saying where the spell originates from while the latter specifies that you are actually the caster, thus sculpt spell would be applicable. It could be made clearer but essentially the user of the item is only ever declared as the actual caster, not the item itself!

Because of the flavor text of the item, yes, 100% an evocation wizard would be able to sculpt a fireball from this wand because the wand specifically says: 

"While holding it, you can use an action to expend 1 or more of its charges to cast the fireball spell (save DC 15) from it." 

Since it says you are casting the fireball spell, and the Sculpt Spell ability says "When you cast an evocation spell..." you would be able to do it.

I know this is very late to the game, but in general magic items don't blow up when broken there is no real rule for it except for certain items. Also think about it, what magic shop would be allowed in a city if any fool breaking into it and accidentally snapping a single item would blow up half a city block.

What an insane amount of power. This is a pocket rocket-launcher. 
Look at a staff of frost, you can cast cone of cold.... using 5 out of 10 charges. Two casts and you risk breaking it. 
But this, 6 fireballs no problem. No need to bother overcasting, 8d6 is plenty. 
A bit better balanced if you use my homebrew version of fireball, which is 10 ft radius at level 3, 15 at 4, and 20 at 5+.
Fun fact, a 20 ft radius that spreads around corners could incinerate almost my entire house. 

Quote from Geann >>

When you make use of a wand, you cause a charge to be used.  Properly speaking, the *wand* casts the spell, not you.  It would not benefit from any abilities of the person holding it.  It might be more fun that way, but it was probably not the intent, and the rules are fairly clear about this, so talk to your DM and see what they say.

 Nope, you cast the spell. Granted, you cast the spell from the wand, but, importantly, you still cast the spell.