Sample of failure rate with necro spell Feign Death over 135 attempts (no spell interruption or cancels)
Code:
➜ eqLogs git:(master) ✗ echo "scale=4;$(grep -c 'Xenow has fallen to' ./eqlog_Xenow_project1999.txt)/$(grep -c 'You begin casting Feign' ./eqlog_Xenow_project1999.txt)"|bc -i
scale=4;7/135
.0518