Ideas and suggestions.

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JintoLengley

There’s an Ogre Fist in the castle, so armor can play such a nasty trick...

Clear and understandable. Is that a bad thing?

Wicc

Yep, and there’s also a 1-2 level spell prohibition. So, using Avatar of Death in the Castle is a questionable strategy, even with the red orb. Unless it works as a surprise if the opponent isn’t aware of the trick.

If there are counterarguments to the strategy and it’s not that overpowered, that speaks to the diversity of the gameplay. Of course, it’s all theoretical. It might work in some cases, and not in others.

Wicc

Based on my experience in War of the Tower (where the orb is banned), Avatar of Death is either for a rush on the 2nd week or for a second front, and it’s better to equip the Pope with normal artifacts. I think the niche for Avatar of Death in the Castle is roughly the same.

It’s highly doubtful to have Avatar of Death on the 2nd week, and even for a second front. The chances are no more than 1%.
However, using Ogre Fist and Avatar of Death with Chain Lightning in a full-fledged game is quite likely. I’d estimate it at 20%.

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Ideas and suggestions.