Silvanis
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I feel even more sorry for the wizards in the Academy than for the liches – they are usually supposed to be the main attacking force. But then the titans come to the rescue, starting to absorb lightning strikes with their 300 HP, while no one protects the liches...
The liches also have the problem that they damage everyone – including their own undead.
But, on the other hand, this can be used to your advantage. They deal decent damage, and they are the only ranged unit in the Necropolis; if you consider that you can't expect the same as in Heroes of Might and Magic III in Heroes of Might and Magic II, then it turns out that without liches, the battle will almost certainly result in losses (but, of course, anything can happen); at least you'll almost certainly have to use magic.
The liches also have the problem that they damage everyone – including their own undead.
But, on the other hand, this can be used to your advantage. They deal decent damage, and they are the only ranged unit in the Necropolis; if you consider that you can't expect the same as in Heroes of Might and Magic III in Heroes of Might and Magic II, then it turns out that without liches, the battle will almost certainly result in losses (but, of course, anything can happen); at least you'll almost certainly have to use magic.