Spell Request

[Doom_AngeaL]

Hey there, thanks for reading. I need a spell that will heatseek its target but if it comes into contact of another untargeted enemy it explodes. And just to add on, in an area of 350 around him, Show the flame strike special effect and also kill. Its meant to be one-hit. All credits will be given. OH! One more thing, The projectile has to be the defence ancients projectile, the rock.
Thanks in advance.
~~ DooM