Демон вполне может знать, что паладины хороши против страха. Вопрос в том, откуда он знает, что перед ним стоит паладин?
A creature with Intelligence 7 or less operates wholly or almost wholly from instinct. This doesn’t mean it uses its features ineffectively, only that it has one preferred modus operandi and can’t adjust if it stops working. A creature with Intelligence 8 to 11 is unsophisticated in its tactics and largely lacking in strategy, but it can tell when things are going wrong and adjust to some degree. A creature with Intelligence 12 or higher can come up with a good plan and coordinate with others; it probably also has multiple ways of attacking and/or defending and knows which works better in which situation. A creature with Intelligence 14 or higher can not only plan but also accurately assess its enemies’ weaknesses and target accordingly. (A creature with Intelligence greater than 18 can do this to a superhuman degree, detecting even hidden weaknesses.)A creature with Wisdom 7 or less has an underdeveloped survival instinct and may wait too long to flee. A creature with Wisdom 8 to 11 knows when to flee but is indiscriminate in choosing targets to attack. A creature with Wisdom 12 or higher selects targets carefully and may even refrain from combat in favor of parley if it recognizes that it’s outmatched. A creature with Wisdom 14 or higher chooses its battles, fights only when it’s sure it will win (or will be killed if it doesn’t fight), and is always willing to bargain, bully, or bluff if this will further its interests with less resistance.
Другой вопрос, какой Knowledge будет кидать на это демон. Для демона человек\орк\... явно иноплановец - резонно кинуть Knowledge(the planes) на такой случай, у разумных аутсайдеров он достаточно часто есть.
У паладинов обычно почти безлимитный детект ивил - у его идейных противников резонно ожидать чего-то зеркального.
И если мы в детекте видим группу, один из которой одет в тяжёлый доспех и сияет в детект гуде как прожектор - резонно к нему присмотреться поподробнее.
Другой вопрос, какой Knowledge будет кидать на это демон. Для демона человек\орк\... явно иноплановец