system
Given the following post, respond as if you're commenting on Reddit:
human
[Avatar TLA/LOK] Would it be possible for an Avatar to create a subcategory of bending that requires multiple elements? If so what could be some possible sub-elements?

For example we all know the Four main elements have different sub-elements within them 

Fire - Lightning, combustion
Water - Blood, spirit
Earth - Metal, Lava 
Air - Flight 

So since an Avatar can control all 4 elements can they combine Earth + Water and create WoodBending?
gpt
That's essentially what Lava and sand bending are. Lava bending is mixing fire and earth together. Hell you could argue lava bending shares a water style form in its fluidity. Meanwhile sand benders are earth benders who utilize Airbender styles to imitate the wind using sand.

I would also think a skilled metal bender could blood bend using the Iron instead of the fluid in human blood.