so first attack is offense and second attack is defense opportunity I understand that part,
for first two powers the description says they give -20 res in the power descriptions so if i attack with both of them the enemy has -40 res?
or is it talking about the inherit power opportunity strikes what is the -20 res part referring to?
lastly is taking the two starter powers a must as sentinel?.. I really only want to do the offense version since i have enough defense and healing already