Create an arc of flame that burns one target plus one additional target/3 levels for 1d6 fire dmg/CL (maximum 10d6). Reduce the damage by 1/2 (rounded down) for every additional target the discharge arcs to.
A blast of hellfire deals 1d6 damage per caster level (maximum 15d6) to the target (half fire damage half unholy damage.) If a creature is killed by this damage it must make a Will save or be damned to Hell.
Endzeitgeist says: "Legendary Classes: Covenant Magic is worth every cent thrice. At least. This is the new gold-standard for class-design against which all other classes will be judged. My final verdict would be 6 stars, if I only could – hence, 5 stars + seal of approval and a high chance that this will feature on my Top Ten of 2013-list.