Path of Exile?

Yay! The Countess strikes again! 

 

demolished side = Ides

Promenade = March

Brutal = the assassination of Julius Caesar by Brutus and his fellow conspirators.

The Ides of March - the day the assassination took place.

The same confusion gains self, loses energy, and thus does enfeeble.  (1 word, 5 letters)

Psych?

No, I'm afraid not.

Gonad?

No, not gonad.

No, it isn’t maims.

 

I will add a clue:

 

 

 

Confusion can look back, rather than forwards.

Another clue: Einstein’s contribution must go.