If you land an unarmed attack you can increase your exhaustion level by 1 to go for an energised attack.
Energised Attack:
An energised attack (if it hits) can do one of two following effects to the victim; on a failed DC (STR stat num. of the attacker) CON saving throw the victim wherever struck will be knocked prone and given a specific effect depending on where they were hit from the options below and take 5d8 + STR bludgeoning damage, OR on a successful saving throw they block the attack and will be pushed back 30 + STR stat feet in the direction they were hit and take 5d8 + STR bludgeoning damage.
- Head - knocked unconscious for 5 - their CON modifier rounds (if this goes below or equal to 0 they are only knocked prone)
- Limbs - limb is broken, given disadvantage on all actions or attacks that need the specific limb and if hit in the leg their moving speed is halved
- Ribs - rib(s) are broken, moving speed halved, given disadvantage on all STR or DEX rolls as well as all attacks
However, the player can decide to hit in other places and th DM is responsible to decide the effects, using the options above as guidelines to the damage/effects dealt.
If the player rolls below 5 for their to hit roll for the energised attack, whether the attack hits or not, the effects which would've been dealt to the enemy will be dealt to the player (with whatever part of their body they used to attack with) including damage and the effects above or any others the DM sees fit.
If the player rolls a natural 20 on their to hit roll and the enemy is below 101 hit points or has any exhaustion levels and the enemies CON modifier is below +5 then the attack dealt no matter where it hits will deal an attack of which deals 10d10 + STR magical bludgeoning damage, if they survive this they are knocked unconscious for 3d4 minutes.
The energised attack also creates a force of air in a 30ft cone of which anyone in this much succeed a DC 15 STR saving throw or be pushed back 30ft, this force of air if coming into contact with a structure deals 5d10 + STR bludgeoning damage.