half your maximum HP in one blow. This puts you at risk of dying if you fall to 0 HP.
Not all failures are created equal. In CoC, failure can be catastrophic. call of cthulhu 7th edition cheat sheet
The 7th Edition uses a system where players roll two 10-sided dice (tens and units). To succeed, you must roll equal to or lower than your skill or characteristic. Call of Cthulhu 7th Edition Cheat Sheet | PDF - Scribd half your maximum HP in one blow
Your mind is a resource. Lose too much, and the Keeper takes your character sheet. call of cthulhu 7th edition cheat sheet