not playing-comments but reading comments :
sealing being permanent seems a bit "hard". If the city falls into the hands of somebody else (or the elohim are destroyed), one could assume that the invader could lift the seal, or at least try.(I mean, sealing is a hard option : removes a benefit -mana- + doesn't allow for bonus of "exploring"... it is a mechanism that reduces options for the player... generaly it is not really a good strategy.)
2 propositions :
-maybe you'll want make "sealing" not permanent but automatically enforced while the monastic order is present in nearby Elohim city or if a monk/paladin with the
sealing ability is guarding the UF.
-Or maybe you can create a "spell" (like explore lair/UF) that is "unseal" available to all on a sealed tile. But only if 1) no Elohim monk/paladin on the tile AND 2) no Order of YYY city around.
the "unseal ability" costs some gold, maybe sacrifice the unit, or rise the risk of a bad outcome while exploring.
any of those 2 options means that to unseal a sealed UF, one has to make war with the Elohim and eradicate their influence on said UF.
Then :
orders that seal a feature are order that gives bad benefits for the Elohim City. It is as if it is a triple damaging action : 1) lose the UF's mana/benefit ; 2) cannot explore and gaing xp/sage/treasure; 3) have a "bad city" due to the order effect : -2happy / -health; -
% ...ETC. only bonus is the disciple promotion.
BUT THEY ARE NOT EVEN THE BEST ORDER PROMOTIONS !!
Maybe sealing an "evil UF" should give some bonus for the Elohim... either a city-bonus or a civ-wide bonus instead of a city-wide malus ...
I mean :
Guarding "good UF" is self-evident : who wouldn't want to keep an eye on those bonus ?
But guarding/sealing "evil UF" is the holy mission give by sucellus (or shirona?).... maybe the Elohim should be more "entranced / motivated" while guarding an "evil UF" as they are closer to accomplish the task given by the angel.
(is my reasonning understandable ?)
maybe the sealing of evil UF or the monastic orders that seal the evil UF should give city or civ-wide benefits for Elohim : +happy or +
% for unit production/disciple production or +xp for disciples in order-city/civ as the Elohims are motivated by the accomplishment of The Holy Task and many youngs are inspired to go train in monasteries and "ward the world from evil".
my 0.2
Well maybe if you explain your reasonning for giving malus to sealing monastic orders AND for making sealing permanent I might understand