choose either one or two realms, depending on class.
In Hengband, you cannot be as proficient in secondary realm as in
-first realm. But you can change secondary realm to other realm of
+first realm. But you can change secondary realm to another realm of
magic even in the middle of the game. For that, you must choose a
spellbook of new realm in the study command ('G'). But beware! After
changing realm, you will forget all spells of old realm, moreover the
-number of learning will not be restored and be lost permanently.
+forgotten spells still count towards the total number of spells you
+can learn, limiting the number of new spells you'll be able to study.
Note that certain realms may be prohibited for some classes. In the
table below, '1' indicates that the realm may only be the first