You can make a good one without much. But with the correct item they are extremly godly.

Nope, the correct order would be 10~ blessed hammer, max concentration, 5 Vigor, max blessed hammer, max blessed aim and then holy shield.

The reason why you should stop at 10 blessed hammer and raise conc instead is mostly because at that level you mana is low. Puting point directly in blessed hammer wouldnt make much a diff. other then having a heavier mana cost. + the aura can ehlp your whole party which is more useful at that level. The problem with mana can be quickly fixed with a 6 socket 1 handed weapon where you put 6 tir in. But even then like i said. The aura is more useful during that time anyway.