Blast everything in a 90 degree cone up to 30 ft. long extending from you with elemental magic reminiscent of a dragon’s breath.
Intensify: Add up to 10 ft. to the cone’s length per boost from Intensify.
Friendly Fire:
You can try a DC 15 test of Spellcraft to exclude a target from being affected by your spell.

All creatures in the area get a health (reflex*) save.

Fail:
The creature takes 1d10 elemental damage.
Intensify: +1d10 elemental damage per boost from Intensify.

Pass:
The creature takes half as much damage.

Suggested Backfire: The spell blows up in your face. You take the full damage unless you pass a health save for half damage. Noone else is affected.

*If you cast this spell with the poison or dark element, the save against this spell is a health save.
Otherwise the save against this spell is a health (reflex) save.
Certain abilities interact with health (reflex) saves.

You may spend an action to inhale deeply and become supercharged with arcane energy until the end of your next turn.

When you cast Arcane Cone while supercharged, you may spend your supercharge to
make that Arcane Cone deal additional damage equal to the damage it would normally deal (including damage buffs such as Intensify and Evocation Training),
plus 1d10 elemental damage,
extend the cone’s length by up to 30 ft.,
and increase the DC to Counterspell it by +5.

Telegraphed: Those trained in the arcane arts are likely to know what this ability does.