Dead Riff

You bardic inspiration flows through your veins, you play a harsh, bittersweet symphony which shakes the ground vigorously. Hands equipped with weapons. Soldiers of all shapes and sizes,  generations of rage and justice come forth to your will and for ten minutes your are the general of a high performance bone crushing skeleton army.

At higher level (Lvl 7) 

At level 7, the spell is upgraded, not only does your dead rift spell call upon a skeleton army, if near water your call upon a skeleton navy. Boats, skeletal pirates and depending on the D20 roll, your can call upon a small Dead Sea monster that had sunk a navy fleet with its ship crushing jaws.

At higher level (lvl 10)

Once again your spell is upgraded, It can now call upon armies but certain skeletal creatures obtain their magical abilities such as a skeleton dragon able to breathe fire.

Major and Minor 

There are two ways to play the spell major and minor. Major would mean that the army type you would call upon would be higher intelligence and dexterity, the army would be strict and technical (Romans/Greeks etc.), Minor would mean that the army would be savage and have higher strength and wisdom, Even though they are less civilised, they most likely have more experience (Saxons/Celts etc.)

Drawback 

You must roll a D20 to complete this spell, D20 roll + charisma, if you roll lower than 14 the spell does not work in your favour, the army turns against you and your peers, depending on how low the roll is, the worse they attack you ( for example you get 13 the army throws a few cruel insults, 1 they brutally stab your up your bumhole). If higher than 14 the spell works, the higher the more efficient and powerful your army is.