Shield Skills in Rohan
Mostly just charge, but if one wants, bless shield as well. You never know when you are going to be a major damage focus and dropping your dagger for 20% block rate and extra HP/p. def can help get you through. The best way to be hugely successful is to be adaptive. There is no set one build, one weapon (Rohan Gold) set, one pet that will always be the best in every situation. Understanding this and the similar concepts in other games, and being able to change on the fly is what separates the best players from the great players.
Hell, in Soul Cal IV we are considered one of the best Siegfried players world-round, after a round or two of getting familiar with the way they play said character and it is entirely because we know how to change our style based on our opponents character in Rohan. No build, and no guide will ever be able to give you that sort of playing skill, it is something you have to learn and perfect.
Back on point, Straight Repulse 5 is barely an improvement over level (Rohan Crone) 4, and level 1 gives you the extra attack skill that still does max dmg to your first target anyways, which at end-game is either PvP or bosses more than you need the AOE from it. Blue Drain is an amazing skill, it can cripple an enemy in PvP, and for some bosses you want to sap their mana, even though level 1 usually gets that job done. Anything beyond level 1 is the same as Assault Crash, just for leveling purposes.