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We are not very familiar with the game mechanics - "Counterspell" is not a very effective ability, as it is easily countered by wizards in the hero's army (of course, the hero himself can take on this counter, but in most cases, it is more beneficial to sacrifice the wizards' turn and, thus, free up the opportunity for the hero to cast spells).
What does this have to do with the game mechanics?
When fighting Naadir with Alaric, there is always an enemy counterspell active. I was convinced of this when I came with a small army. It is a scripted and personal ability, and it triggered at least twice when my wizards cast spells without any problems. As a result, the hero could only cast Prayer and attack the Archlich for 1/3 of his health, and he could also have cast Surveillance (if it were effective) and Banish (if I had it during my first visit), as well as any other abilities with 0 points, if any.