I got a frequent spell cast interrupt issue as reported here: https://www.shroudoftheavatar.com/f...er-95-chance-even-with-gm-tranquility.156220/ And there is an old thread explaining how spell cast interrupt calculate: https://www.shroudoftheavatar.com/f...ted-far-to-often-by-inferior-opponents.71341/ The "Tranquility" skill has very little effect for cloth user on fighting high tier mob. For example, you have 1,000 health and level 100 Tranquility, you will have 10% spell interrupt when you receive 60 damage: (60 damage - 10 casting interrupt tolerance) * 2 / 1,000 * 100% = 10% If you got level 120 Tranquility, it just allow you taking 2 more damage to have the same spell interrupt chance. Most high tier mob hitting cloth user for damage around 100 to 1000+. That's why spell cast are always being interrupted. It looks like the current design favor high health player / heavy armor user / player with high defence to cast spell without being interrupted.