Unholy Might

You call upon the power of malicious forces to grant yourself unholy strength at the cost of your sanity. The effect of this spell with be determined by the material consumed. When this spell ends you must roll on the short term madness table within the DMG. This madness will last until the end of your next turn.

Undead: Your skin becomes pale and tought, your eyes are sunken and emit an eerie glow, your canines grow into large fangs. 

• You have advantage on constitution checks and saving throws
• Necrotic damage you deal will heal you for half the damage dealt
• You gain a climb speed equal to your walking speed

Aberration: Your skin changes color to more blue or purple hues, 1d4 eyes emerge on your head, and your voice echoes.

• You have advantage on wisdom checks and saving throws
• You can concentrate on another spell for the duration of Unholy Might so long as the spell is below 5th level. (Both spells will end on broken concentration)
• You gain a fly speed equal to your walking speed, and you can hover

Fiend: Your skin changes color to more red and black hues, horns emerge on your head, and your eyes turn serpentine.

• You have advantage on dexterity checks and saving throws.
• Your weapon attacks and damaging spells inflict an additional 4d6 necrotic damage once per turn.
• Your movement speed increases by 15ft.