explicitly say which machines don't work in the nether and end

src/main/resources/data/naturesaura/patchouli_books/book/en_us/entries/creating/ancient_tree.json

@@ -8,6 +8,10 @@
             "type": "text",
             "text": "A basic way of replenishing the $(aura) in an area are $(item)Ancient Trees$(). Once an $(item)Ancient Sapling$() is created, it will grow like a normal tree, but its leaves will start increasing the $(aura) levels back to normal slowly.$(br)The tree, however, does not fare well during this process: As its leaves' $(aura) is drained into the world, the leaves start dying, leaving the tree bare if enough is drained."
         },
+        {
+            "type": "text",
+            "text": "It should additionally be noted that, while this tree looks especially beautiful in more hellish regions of the world due to the matching color scheme, it $(italic)does not work$() outside of the $(thing)overworld$() realm, as that is the only area where plants can thrive in the appropriate way."
+        },
         {
             "type": "naturesaura:tree_ritual",
             "text": "Creating the $(item)Ancient Sapling$() using the $(l:practices/tree_ritual)Ritual of the Forest$()",

src/main/resources/data/naturesaura/patchouli_books/book/en_us/entries/creating/flower_generator.json

@@ -12,6 +12,10 @@
             "type": "text",
             "text": "The caveat, however, is that supplying it with one and the same flower constantly will cause it to lose the ability to consume that flower's $(aura).$(br)This means that, if one wants to get the absorber to work efficiently, they will have to supply it with $(thing)different kinds$() of flowers after one another.$(br)For the absorber to reach maxmimum efficiency, about six or so different kinds should be needed."
         },
+        {
+            "type": "text",
+            "text": "Additionally, it needs to be said that, since the flowers that it is supplied with naturally only appear in the $(thing)overworld$() realm, that is also the only area where this device functions at all. In other realms, for example, the more $(thing)hellish$() regions, this machine will have no effect."
+        },
         {
             "type": "crafting",
             "recipe": "naturesaura:flower_generator",

src/main/resources/data/naturesaura/patchouli_books/book/en_us/entries/creating/oak_generator.json

@@ -10,7 +10,7 @@
         },
         {
             "type": "text",
-            "text": "normal-sized oaks to grow.$(br)In the process, the additional natural energy of any saplings that were growing into big trees gets turned into a quite substantial amount of $(aura) that will be fed into the environment.$(p)Quite obviously, a great way to make use of this is for an automatic $(thing)tree farm$()."
+            "text": "normal-sized oaks to grow.$(br)In the process, the additional natural energy of any saplings that were growing into big trees gets turned into a quite substantial amount of $(aura) that will be fed into the environment.$(br)It should be noted that, as the $(thing)overworld$() realm is the only area where the trees in question naturally grow, it is also the only area where this device has an effect.$(br)Quite obviously, a great way to make use of this is for an automatic $(thing)tree farm$()."
         },
         {
             "type": "crafting",