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I've seen the Grail once. As for something more common...
I didn't understand the phrase "Birds don't give HP" at all. 800 HP per week—is that not "giving"? Does anyone even have a higher weekly growth without caches? I don't recall anything like that...
Effective tactics for Tower? Usually, something like 4 heroes roaming with 1 gargoyle each, upgraded gremlins, and one hero with full power: gremlins + the remaining gargoyles—he goes around trying to tear everyone apart. Building up something like Nagas in Stronghold on the first [town] and Giants in Castle on the second... In battles, we mean that gremlins have 8 shots... There are many native heroes with Archery, some are scholars, so it's possible for all heroes to learn Archery... All heroes start with a book... Solmir has Chain Lightning, Nila has Armor, Torosar has Tactics and Ballista specialization, but alas without the Ballistics skill, although Archery is in the book... There are also Kira/Saira... Kyr is good for this castle... I don't know how to take Dragon Utopia with him... Maybe golems will help due to their low cost, single-cell nature, and toughness; besides, you don't feel too bad losing them... If there is no Dragon Utopia—maybe it's for the best—magic is very good in this city; Dimension Door or Fly, and life becomes more pleasant.