Ahmose and Saffron are good tanks early on, however once you reach a certain point they become ineffective for 2 reasons 1. when players on your server unlock heroes like Rhize Adam and KT that can hit the heroes behind the tank before he dies. 2. You reach a point in the pve content were you need to use self healing heroes up front as the npc's have so much health your tank, no matter how heavy his defense is, will die eventually. Some heroes like Aphro and Bryne have built in resistance that makes them somewhat succesfull up front. In my opinion though the best thing to do is use heroes that have high base states of command strength and intelegence and star them up as much as possible. An example would be KT as his stats start of at 105 all so he gets a real good boost from stars. Aphro also has high base stats so she actually fits into both catagories although she can be countered by heroes like general al who has base magic resistance so you have to take that into cosideration also