The Indomitable Humanish Spirit

Prerequisites: Human or half human race

You possess what is known as "The Indominable Humanish Spirit" Nurtured from a young age you refuse to back down, always standing back up no matter the cost.
A flame burns inside you, as you walk along the path of greatness you always got back up and always stood strong in the face of adversity, you show no weakness in front of others, standing strong and showing that through sheer while you can persevere! ᴿᵃᶜᵉˢ ᵒᵗʰᵉʳ ᵗʰᵉⁿ ʰᵘᵐᵃⁿ ʷᶦˡˡ ⁿᵒᵗ ᵖᵉʳˢᵉʳᵛᵉʳᵉ, ᵃⁿᵈ ᵗᵃᵏᶦⁿᵍ ᵗʰᶦˢ ᶠᵉᵃᵗ ʷᶦˡˡ ⁿᵒᵗ ᵍʳᵃⁿᵗ ᵃⁿʸ ᵐᵉᶜʰᵃⁿᶦᶜᵃˡ ᵇᵉⁿᵉᶠᶦᵗˢ, ᶜᵒⁿˢᵘˡᵗ ʸᵒᵘʳ ⁿᵉᵃʳᵉˢᵗ ᵈᵐ ᵗᵒ ˢᵉᵉ ᶦᶠ "ᵀʰᵉ ᴵⁿᵈᵒᵐᶦᵗᵃᵇˡᵉ ᴴᵘᵐᵃⁿᶦˢʰ ˢᵖᶦʳᶦᵗ"™ ᶦˢ ᶠᶦᵗ ᶠᵒʳ ʸᵒᵘᵎ
 Taking this feat grants the following benefits:

Increase your constitution score by 1, to a maximum of 20.
If you fail a saving throw, you can choose to succeed instead. Once you use this feature you can’t use it again until you finish a long rest

• "I survived because the fire inside burned brighter than the fire around me. I fell down into that dark chasm, but the flame within me burned on and on." - ???