I don't want to use exploits, but thankye.
Thanks on the clarification on what skills I need. Based on suggestions from the other thread (instabuy "regrowth" which is in fact regeneration, up vitality early and seek for primordial magic trainer who is, surprisingly, not in the first village but wherever else so you don't waste cash on identifying) I upped only might, magic an vitality. Perception is thus low on all characters and this hidden passage is - gears.
You may ask what's the problem then, I'll say the problem is I'm playing M&M game, not Might, Magic and Perception game.
Of course there is no rule to complete a dungeon in one trip, but also there is no rule not to. Right after I went out of the first village, didn't explore outdoors very much, but I've completed Lighthouse. Not in one trip though - I went back once to grab water blessing again as naga spellcasters are lurking inside plus I had to revisit the village for the bloody only 6 food/repair worn items/buy better (read imbued with fire) items. The difference in battles however is not huge as I still have mana problems. In fact the mana design and no square formation but only line formation is so bad that it looks as if the best option is to play as 3 nearpure might and 1 tank/healer.
You don't have to go Blackguards vs MMX, but I will. Blackguards is highly challenging game and with poor choices on character development you may get stuck and restart because of that. For example I'm pretty sure some players will up for example perception on nonranged characters instead of investing those points somewhere else. Another example are spellbooks, you don't have to learn every possible spell out there on all spellcasters. Is MMX highly challenging in a way you can get stuck because you've evolved your party in the wrong way? Dunno, haven't finished it, but it looks as if it's not like that.
Anyway, I love the punishing randomness in Blackguards. Meanwhile, randomness is a part of M&M, for example if you use bows/xbows on the approaching group of hostiles, you shoot at random target, can't focus one.
If M&M was Grimrock2 I wouldn't sing any praises. From Grimrock 2 I wouldn't ever expect the lame plate puzzle on Lighthouse top. You don't even know it's there and it's there so you can't escape the boss, and when the boss is killed there is no automatic teleport activation but a puzzle that's utterly easy. In a way, if I saw a thing like that in Grimrock2 I'd spit on it even worse - because M&M10 is Limbic's first dungeon crawler.
And I can't understand the hatred on games because the publisher is Ubisoft. Yes Ubisoft is evil, nasty and is treating ppl like animals. Do hate Ubisoft, do hate uPlay, but not the game or it's devs. Escpecially because after the Ubisoft/Blackhole scandal, small studio Limbic took the job to polish HoMM6 and they did it perfectly, plus they've communicated with fans over forums about balance, exploits and glitches, totally different from Bethesda ignoring bugreports.