Beheading Buzz Saw

You compress molten scraps pulled from the Plane of Earth into a spinning disc with gruesome blades protruding from its edges. It wheels forward in a line 60 feet long and 5 feet wide, slicing through anything and anyone in its path. Each creature in the line must make a Dexterity saving throw. On a failure, the creature takes 5d10 Slashing damage and begins Bleeding for 4d6 damage for 1 minute. If a creature fails its saving throw by 10 or more and has a head, it must additionally make a Constitution Saving Throw. On a failure, it is decapitated; the creature dies if it can't survive without the lost head. A creature is immune to this effect if it is Immune to Slashing damage, doesn't have or need a head, has legendary actions, or the GM decides that the creature is too big for its head to be cut off with the blade. Such a creature instead takes an additional 6d10 Slashing damage.   At Higher Levels. When you cast this spell using a higher level spell slot, increase the initial damage (but not the additional damage from a failed Constitution Saving Throw) by 1d10 and the Bleeding damage by 1d6 for each slot level above its base level.
 

Concentrate Manipulate Metal Source Rage of Elements pg. 142 2.0 Traditions arcane Area 60-foot line Defense Reflex You compress molten scraps pulled from the Plane of Metal into a spinning disc with gruesome blades protruding from its edges. It wheels forward, slicing through anyone in its path. Each creature in the area takes 5d10 slashing damage and 4d6 persistent bleed damage, with a Reflex save.   Success The creature is unaffected.
Failure The creature takes full damage.
Critical Failure The creature takes double damage. If the creature has a head, it must succeed at a Fortitude save or be decapitated; this kills any creature except ones that don't require a head to live. For creatures with multiple heads, this usually kills the creature only if you sever its last head. This second save has the death and incapacitation traits.

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Heightened (+1) The slashing damage increases by 1d10, and the persistent bleed damage increases by 1d6.