Legend has revealed information about the legendary creature and is not hindered by Mind Blank, as Legend has been cast on the caster, not the legendary creature
I found this answer to a similar question: Why does Mind Blank stop the Feeblemind spell? In this question, it is said that Mind Blank prevents the effects of Feeblemind due to the fact that Mind Blank prevents all effects
films Want spells and Spells or effects of similar strength used to influence the mind of the target or to get information about the destination.
Based on this statement as the basis for what prevents Mind Blank, it seems that the legendary nature of Mind Blank is not prevented. Legend has it that you can
Name or describe a person, a place or an object. The spell reminds you shortly Summary of the main traditions of what you have mentioned, Tradition can consist of up-to-date stories, forgotten stories or even secret traditions that have never been widely known, If what you have said has no legendary meaning, you will not receive any information. The more information you already have about the matter, the more accurate and detailed the information you receive.
By definition, the creature must be legendary for the spell & # 39; Legend & # 39; becomes effective and you said that was the case in your question. This traditionas written in the description by Legend Lore, does not have to come from the creature itself, therefore never affects the mind of hidden creatures and is not prevented,
Legend has never indicated that the information is taken from the creature to be targeted by the spell, that would mean it is not prevented by Mind Blank, Mind Blank can However, prevent a wishing charm from trying to influence the mind of the creatures Legend has it that it affects the spirit of the legendary creatures,
Nepene Nep makes a good point in his answer, that says that
Legend is a divination magic, and Mind Blank blocks prophecy
Legend has a number of self, meaning that it is cast on the caster, not the legendary creature.
Also, I would say that if the creature is truly legendary, using Mind Blank to prevent Legend Lore from working would make it far more difficult to find information on the PCs. The lore they receive may not be very specific, but may contain current stories or forgotten stories invented by other creatures that this legendary creature may not know about.
For example: You could have a very friendly, but shy, legendary Yeti, but the local stories about him all say he's an icy killer.
Players would most likely learn that information about him is more dangerous than friendly.
Another point that has been raised is that Mind Blank also mentions that it prevents
Spells or effects of similar power that are used to influence the mind of the target or Get information about the destination
I have accepted The Mind Blank would only discourage information be extracted from the legendary creature, rather than about the legendary creature, I was unable to find resources or similar spell questions that were used to obtain information about a creature when that creature is not the target of the spell.
My argument is that Mind Blank only prevents information from being displayed Obtained from the legendary creature and the Legend Lore would provide information known to other creatures, If no one else Creature knows any Information about the legendary creature, it would not be legendary by definition,