From Zelda Legends Wiki
1/2 Magic simply halves the amount of magic needed to perform a magic attack. You can get it after obtaining the magic hammer from the Dark Palace (Dark World dungeon #1). After getting it go to Smithy’s shop to enter a hole. Pour some magic powder over the green structure, and a purple bat with a split personality will awaken. He then “curses” you by cutting your magic by half to punish you for awakening him. This might be scary until you realize that 1/2 magic is actually good, since it actually effectively doubles your magic power instead of halving it. It can be quite useful in combination with the Magic Cape or the Fire Rod.
After doing some research I have been able to tell the following about the magic meter in ALttP. Your magic meter when completely filled has 128 Magic Points. Each time you use magic, a number is subtracted from your total. For every 8 points used or added the meter will change.
|Spell||Full Magic||1/2 Magic|
|Cane of Somaria||8||4|
|Cane of Byrna||16/second||8/second|
For the sake of completeness here's also a small table that shows the amount of Magic Points you recover from certain items:
|Magic Recovery Item||Points added|
|Small Magic Bottle||16|
|Big Magic Bottle||128|
Here's what the purple bat yells at you when you wake him up:
Hey! Blast you for waking me from my deep, dark sleep! ...I mean, thanks a lot, sir! But now I will get my revenge on you. Get ready for it! ...Err, is that OK with you, sir? Heh heh heh! I laugh at your misfortune! Now your magic power will drop by one half! Congratulations! Now, do your best, even though I'm sure it won't be enough! Have a nice day! See you!
Entry submitted by Iron Knuckle.