I've been GMing for a couple of sessions now and I'm still struggling at making encounters or situations more difficult. I will describe dangerous situations and encounters in fiction but the mechanics make it too easy for my players to succeed.

For instance no matter how big I describe the Troll, if the fighter of the party charges him and swing his sword, roll+2 for Hack and slash, he'll easily hit the troll. Almost 40% chance to hit without consequences.


Question: How to edit error messages in devise
Answer: You can do the devise specific translations using the 
devise.es.yml in your config/locales folder

List of all the different translations is given here in official devise wiki