Welcome to Gaia! ::

I am putting this just for fun. Here are some battle attacks/defense that I made up:

Guitar Hero: Metallica Made-Ups:

• Master of Puppets - Your notes become disabled. At this time, you can take over your opponent's fretboard for 3 seconds.
  
• Hit the Lights - Your opponent's fretboard goes into a strobe effect (flashing rapidly on/off) for 7 seconds. [Similar to Camera Flash attack in the On Tour games except repeated]
  
• Fight Fire with Fire - A defensive power-up that lasts 15 seconds but your opponent still can use his/her attacks. At this time, if you get hit by an attack, your opponent's battle attack backfires onto him/her. This is a counter-attack.

Others:

• Backfire Shield - Same as Fight Fire with Fire except not Metallica themed.
  
• Invert - Turns your opponent's fretboard upside-down.

Yes. You can make your opponent fail with a Master of Puppets attack but the duration is very short. You can basically take over your opponent's controls. The Puppet Master!!!

I did play Zelda II: Link's Adventure on GameCube but I wasn't far into the game so I don't know the joke yet.

XP Error. Yeah, he has no practical use. You can find him in one of the houses. He's sort of useless. Tho Bagu was hard to find if you didn't actually know where he was. Hiding in the trees, stupid forest man. xD

Sorry I got off topic.

Ooh. Here are some that I recently thought of:
Performance Swap: The current position of both player's Rock Meters will be switched.
Difficulty Swap: (Only available if both players are on different difficulty levels.) Both players swap difficulties with eachother.
Endeavor: The player with the highest performance rate (their rock meter is high) will go down to the other player's rock meter to be equal with them.

Rock or Die: All battle power-ups becomes disabled when used. The Rock Meter becomes disabled too. The first person to make 3 mistakes (missing notes/overstrumming) loses. This effect lasts for 32 measures.
CURE: Wait 32 measures.
TIPS: Don't choke and try hit every note as possible without messing things up.

Kamikaze: When this is activated, when your Rock Meter goes to dead red, both players loses and ends in a draw. This effect lasts for 4 measures.
CURE: Wait 4 measures.
TIPS: Kamikaze (Godly Wind) attack!!! Boom! pirate

Suicide: YOU LOSE!!!! wahmbulance
TIPS: Do NOT use this!!!

Winnersville: YOU WIN!!!! xd
TIPS: You already won!

Zero Gravity: Your opponent's strumming lags by 0.5 seconds for 8 measures.
CURE: Wait 8 measures.
TIPS: Strum a bit early.

Rock On!: Your Rock Meter goes to full green.
TIPS: Use it when you are about to fail.

Replay!: The song starts back all over but everyone still have their Rock Meter performance and Battle Power-Ups.
TIPS: Use it at the end of the song if you don't want to go into Sudden Death/Do or Die.

Time Skip: When used, the song skips to the next section.
2x Performance: For 8 measures, your Rock Meter recovers twice the amount when you successfully hit notes.

Here is another Metallica-based attack.
Suicide & Redemption: For 4 measures, you will no longer play notes. If your Rock Meter goes and drops to bottom red before it ends, this effect ends and your Rock Meter goes back up to full green.