The Distant Spell Metamagic option gives you the ability to double the Range of a spell, or give a spell with range of Touch a range of 30ft.
If I would apply this to, let's say, burning hands, which states as Range Self (15ft cone), would this increase the cone size to 30ft or would this cast the spell up to 30ft in front of you, with a 15ft cone still?
Other example, aganazzar's scorcher has a Range of 30ft, and the description states:
A line of roaring flame 30 feet long and 5 feet wide emanates from you
in a direction you choose.
Now to me, this implies the same thing as burning hands, but the Range does not contain Self.
RAW I would allow the second case to increase the AoE effect if it is cast with Distant Spell, but not the first, since it is of Range self. But obviously this does not make any sense, so which one is the correct interpretation?
Best Answer
Distant spell says:
Distant spell cannot be applied to burning hands
Burning hands has a range of Self. Self is not a number that is 5 feet or greater, therefore you cannot apply Distant Spell to it.
Note that Touch and Self are not the same range. Touch can be applied to any creature upon contact but self only affects the caster.
Jeremy Crawford supports this exact case with a ruling on Twitter:
Aganazzar's scorcher has its range doubled but not its area
Aganazzar's scorcher has a range of 30 feet. When distant spell is applied to it it will double to 60 feet.
However, it seems that the range does not have any applicability to the spell's effects. Since the line of fire emanates from the caster it seems there is nothing for the range to actually refer to. As written, the spell operates identically to a "Self (30ft line)" spell and perhaps was intended to be written as such.
Regardless, as written, the range would double to 60 feet, but it would have no effect on the length of the line because there is no indication that the two are linked in any way.
Jeremy Crawford seems to support this opinion indirectly via Twitter: