5:28 PM
First, about the box art.
that is the western box art. The game was released in north America about six months after the Japan release. I don't think they would make a new box art and base that on a "beta" stage. Furthermore, the few beta we know off seem to point Marle/Nadia was always an ice/life element user
The clothes, probably they simply wanted do give the characters something to wear since they put the in the middle of a snowy scene. Notice that Crono is wearing a cape in the picture which he normally doesn't have.
The enemy, probably Hekeran
Fought in a cave, present age, so that is indeed different from the picture.
As for the "fire" spell, notice that the three characters in the picture are Marle casting a spell, Frog crouching on the ground and Crono jumping.
That is actually the Triple Tech Frost Arc/Arc Impulse, not the Double Tech Frost Sword like most assume.
And for some odd reason... Frost Arc used an ORANGE/RED aura in game too.
.... or to be more precise, a flickering Orange/Blue aura
you can see that in action here at about 4 second in
For some reason, Marle is casting her spell in a pose that reminds Piccolo's Makankōsappō/Special Beam Cannon in Dragonball (notice the hand pose with the two fingers). Also, in the background you can see the usual Dragonball half-spherical capsule house. There are building in Chrono with that shape, but if I remember correctly they are never seen in Chrono Trigger present era, only in the future.
Trivia: In the DS remake, a blue pallete swap of Hekeran can be actually found in a new snowy area. So, basically, you can actually replicate that scene in game in the remake.
(yep, after being so confused to call Marle Lucca
more than a year ago I did some research on the picture...)
