Taking Energy

At Any level, any trained spellcaster can learn the ability to harvest the life force of any living being in it's surrounding. However, the only way for someone to learn of this feature is to be trained by someone who mastered this ability, has only a handful of powerful spellcaster unlocked the power, and keep that secret well guarded.

Learning the Feature

To learn this feature, the character must be aware of it's surrounding. In any way, the master will ask that the character stop and listen. The player then must succed a wisdom check with a DC of 20. on a success, he becomes aware of every being in it's surrounding, animal and plant. The player then sense the feeling of every being, thought and instinct.

When he share the experience of these being, the player is unconsciously using his mental ability to access other being conscience. When the master will think the character ready( must make 3 consecutive wisdom check with a total of at least 50 ) he then train the student to extract energy from those being, by connecting with them and using the energy of their body as if it was theirs. By doing so, he regain a certain amount of energy, but feel the death of smaller beings, weaker than others, as if he died.

When this is accomplish, the spellcaster can then use this feature.

Taking Energy

Taking energy was one of the most useful mental powers. The user would have access to an almost endless supply of power in the right situations. When perfected, this art could greatly aid a magic wielder. Unfortunately, there are some drawbacks to using it effectively. The flow of energy is relatively slow and thus not an efficient way to kill an enemy. Because it is a mental power and relied on breaking into an enemy's mind, anyone trained to defend themselves against a mental attack could block the drain. There were also wards that, while not protecting people's minds, could prevent their energy from being drained from their bodies. It also took time to master and until then, it could also be dangerous. A careless magician could accidentally draw energy from his allies as well as his enemies, or kill whoever is providing the energy if they take too much. One can also absorb energy from the mind of a person or animal who had recently died. 

To use you first need to succeed a wisdom check for which the DC is equal to 20 + your spellcasting modifier - your Caster level. On a success, you may choose which living being you may take the energy from. On a fail save, every being within range (10x WIS mod) is targeted by the spell. Targeted creature need to make a Wisdom saving throw with your spell save DC. On a success, you fail to take their energy. Roll a d100, and every target share equally as much necrotic damage (count those who succeed in the share, but you gain no energy from them, and they take no damage) You regain energy for as much as the amount of total damage you dealt. You can choose how to use this energy. You may choose to divide the energy for different use as well

You can use it to restore a certain amount of spellslot:

• 10 energy points restores a 1st level spellslot
• 20 energy points restores a 2nd level spellslot
• 30 energy points restores a 3rd level spellslot
• 40 energy points restores a 4th level spellslot
• 50 energy points restores a 5th level spellslot
• 60 energy points restores a 6th level spellslot
• 70 energy points restores a 7th level spellslot
• 80 energy points restores a 8th level spellslot
• 90 energy points restores a 9th level spellslot