Template:Trees

Level	Power
1	[[{{{Power1}}}]]{{ #if: |, [[]] }}{{ #if: |, [[]] }}
2	[[{{{Power2}}}]]{{ #if: |, [[]] }}{{ #if: |, [[]] }}
3	[[{{{Power3}}}]]{{ #if: |, [[]] }}{{ #if: |, [[]] }}

Usage

{{Template:Trees 
 | Power1    = 
 | Power1-2  =
 | Power1-3  =
 | Power2    = 
 | Power2-2  =
 | Power2-3  =
 | Power3    = 
 | Power3-2  =
 | Power3-3  =
}}