Interesting Dispel Magic Questions

[Aimeryan]

So, its still a weapon, but doesn't exist while disapated. So it can't be dispelled then, because it doesn't exist to be targeted then?

Or you can target the caster, at dispel it whether it is present or not?

The question RSP is asking is essentially 'Does creating a magical object allow the object to be dispelled by casting Dispel Magic at the caster?'. It is a relevant question, not an obtuse one.

With Shadow Blade in particular, the spell is cast on 'Self' and includes the ability to call the object to the caster (unstated 'how' other than a Bonus Action cost). Because Dispel Magic ends the spell and not just the relevant effect, it ends the entirety of Shadow Blade if cast on the caster - as long as you rule that there is indeed any effect still present on the caster while Shadow Blade exists. I do, because of the 'Self' range implies something was cast on the caster, highly implying there is a magical link between the caster and object (probably the unstated 'how').

If you take instead Goodberry; this spell also creates an object, however, the Goodberry spell has the range of 'Touch'. Furthermore, the spell does not describe any interaction specifically between the caster and the object, and the spell is Instantaneous (so the spell has already ended). Thus, casting Dispel Magic on the caster would not remove all the Goodberries still existing.

A more relevant comparison may be Drawmij's Instant Summons; the spell marks an object for calling later - similar to Shadow Blade. However, the spell is 'Touch' range, and it specifies how you call it; crush the sapphire used to cast the spell. Would a Dispel Magic on the caster end the spell? No, probably not; it does state 'you' can take the action to crush the sapphire to call the object, which is up to interpretation I would think about whether the 'you' is specifically the caster (which it normally says 'the caster can') or a general 'you'. This is important, because if specific to the caster then this suggests the spell can somehow know this and react appropriately - which could be argued that there is a link present on the caster, however, the lack of 'Self' and any text specific enough to this effect suggests otherwise. Now, if we cast Dispel Magic on the sapphire? Interestingly, it does not say that there is a magical effect left on the sapphire like it does say is left on the object to be called - you could argue that the spell on the object detects the crushing of the sapphire, rather than a magical link specifically - however, as the sapphire is used in the casting I would say there is enough to state a magical effect is upon the sapphire, and therefore Dispel Magic on the sapphire would dispel the spell.

Arcane Lock is also an interesting comparison; once again, 'Touch' range. More importantly here, the spell is DEFINITELY able to discern things about others including who they are and/or a password being spoke nearby - it then reacts appropriately. THIS is the possibility that Shadow Blade could be using to appear when called; the object being granted the ability by the spell to perceive the calling and react appropriately rather than the caster/others being magically linked - however, the 'Self' range on Shadow Blade is suggestive enough that something is being directly cast on the caster, where as Arcane Lock lacks that.