I strongly advise you against using the Black Knights, at least until you free Moro. Every fight you have them in your army (including reserve), the power of darkness will rise by 1% per battle (the counter can go over 100% without limit). In the end, you will be able to free him, but the sooner you can do it, the better.

Unless you set yourself a goal to play with 1 unit only throughout the game, I strongly suggest you get some dragons to do the fighting till you free Moro.

Didnt know it .. but that adds more challenge. :P If i knew it i would play new game intead of this horror kiting. And made fatal mistake on mind skill tree, i was thinking about prayer and i took persuasion -.- which is useless for undead ...

Persuasion is the prerequisite for resurrection, so you didn't waste any points there. It will also work on your black knights, so you will be fine.

Not realy. I was talking about persuation 3 and it doesnt give morale to undead ;/ I have ress 3 :p NO loss is impossible iwth back nights so i went for paladin with ress :p

I am gonna do try insane thing. I cleared first 4 islands. I am gona free Moro. Yep ,lvl 25 to clear the nameless and shettera on impossible(if namles wil not be enough). with just 1 stack. Will be hell a chalenge :D My moro is 92% now. ( Iknow there was one stack game alread but i doubt he went to nameless after rusty lol :P

So chalenge failed. There was no way to win with most of heroes like i planned. For some of them i needed just one more stack for hardest 4 ;p.
But i freed moro in uzala :D So actualy its done. Now just did quest for mesmer so i can at last have my black knights at max number not at half :D

So enemies are in trouble :p

Is it smart to pick up Leadership flags and visit Experience locations in the very beginning of the game if maps are kited so that advanced islands can be visited? Say I visit Rusty Anchor directly after the initial 2 training battles and pick up a Leadership flag. Will the leadership given by the flag depend on my current level, or is it preset and will always give the same Leadership no matter what level I am? The same question applies to Experience locations. Do they depend on the current level of the hero? If leadership and experience is based on the current level of the hero they should be picked up as late as possible. On the other hand, if they are preset constant values it makes sense to pick them up early in the game to get a significant boost in the beginning of the game.

Pre-set ( flags at least, not 100% sure about shrines. )
Exp from flags only differs between the classes obviously, and is also higher when on higher areas i believe but still they are pre-set.

Experience shrines are also dependant on location, not current level. So if you get to Shettera super early, an xp shrine there will level you like 8 times.

yep. Exp shrines crystal wells are main soource of levels. Of course quests too ^^ shetteras fasmodeus and asklepy and rehas grass of memory and secrets of the temple give loads of exp :p