So Sculpt Flame allows my Rank 4 Psyker to fill a potential of 72 square meters with raging fire, seeking my foes blazing demise. As cool as just wreathing myself in flames and generally emitting bursts of explosive power is, I want to use it as my primary offensive power until Rank 5. My reasoning is that I want to follow a logical power-progression, so I'm taking Call Flame as my Rating 3 power, then buying the Psychic Power talent to get Sculpt Flame. Makes sense, learn first to summon a flame on command, then learn to control it. I could have gone for Burning Fists, but I think that's a 5th power type to represent a sort of advanced version of Call Flame rather then an actual separate power.
So, my question is what the damage template of Sculpt Flame if you choose to extend a flame by (your Willpower Bonus) square meters? Example: My Psyker, with a Willpower of 64, is standing 5 meters from a mutant. He casts Sculpt Flame with a Power Roll of 15, and sends a spurt of flame surging to consume the unholy flesh of his enemy in the fiery rage of his deadly wrath.
The mutant must make an Agility Test or be hit for 1d10 + WP Bonus damage with 1/2 WP Penetration. It rolls a 67 - Failure! It screams as it's flesh is seared for 3+6 = 9 Damage, bypassing its toughness bonus of 3 cleanly. It beats at it's flesh to put it out, but the flames seem downright living, and refuse to die - he must now make another agility test to avoid catching fire, this time at a (-5 x WP Bonus) penalty to represent the Psykers will covering him in psionic flame.
What do you guys think? Overpowered, just right, or what?