Well as everyone knows now i am collecting Bretonnia.I always want them but i was found them to boring(Only cavalry).But now i change my mind and i want to start with this topic and will be more jucy ones on the future.
So my question is;Some of our maical lances gave us some extrastuff.Such as The Heartwood Lance(+2 Strenth on charge and re roll failed to wound.)So if i am armed with this lance for example i will take these bonus on the charge but i am able to take the re roll to wound in the following turns?(In the same battle.)Ofcourse the +2 strenth i will take it on charge but the re roll?

Yes, this works every turn of combat. That's a very good lance.

And cavalry is not boring at all: since I play Bretonnia, I ask myself: "Who needs infantry?"

Yes i agree but don't you feel sometimes bored?Only cavalry your enemy could take advantage of this and turn it against you.The only strong emotion that keeps me on bretonnia is that i use this backround of bret in my life too.Understand what i am saying?I am trying to be like these noble knights full of honor.

Every army has its own strengths and weaknesses, the lack of solid infantry blocks makes it difficult to employ several tactics, especially playing defensively; but as an offensive force it is nearly unstoppable, only the most powerful of elites should be standing up to any Bretonnian charge.

Besides, cavalry armies are more difficult to counter then you would think, it takes a lot of strategy and luck to cut them down enough to limit their strength and level the playing field combatwise.

For me, the Brets are a fluff army, I use several paladins to lead my Crusaders across the battlefield. I try not to alter my tactics too much from battle to battle as that doesn't represent the kind of army I control, even if it means making my job several times more difficult.

Can a lord on royal pegasus join a unit of pegasus knights and if not will i take the -1 to hit because it's single model?

Also if my lord has the grail vow can i put the army bsb with other vow in the same unit with the lord?

No character can join a unit of flyers.

A Bretonnian knight character can join only units of knights with the same vow, or a lower vow then he himself has taken. So if your BSB has the Knight's Virtue, then the two characters can only join core level knights.