How do you end a war with the grox in spore?

The best way to kill the Grox is to go to their planets andterraform them into T1 planets. This instantly kills the inhabitants. This is very easy with the Staff of Life, but it is a waste. However, the Grox have over 10,000 planets so this will take you a very long time. Go for it if you have the time tho it could be pretty epic bragging rights online. Remember, The Grox can only live in harsh conditions. Pretty ironic huh?

Zac- but eventually the Grox would completely kill your species while your killing them...