rruuss
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1) One of them is the second version of the Grove town; in September, I managed to install both mods (one was based on Wow, and it seemed to be available at the beginning, and the second Grove was added later, as far as I understand).
Here is where a user posted this mod: http://wforum.heroes35.net/showthread.php?tid=1082
The Grove mod in this collection is available for both Era and VCMI.
3) and the Castle where the Guardians are located is one of the latest versions of the Refuge Castle.
This is not a mod with a separate castle, but just a replacement of the Conflux with this castle, but still:
http://wforum.heroes35.net/showthread.php?tid=1138
This castle for Era is called - Prijut.
P.S.: although here is another one – it's hard to say how complete it is:
https://www.youtube.com/watch?v=-rrnHERg1SE
I found the town, I'll add it