using totem of guarding
This is an ideal creature to defend an area. Earth Elementals can be attacked and destroyed, but they are heavily armoured and take a lot of damage to destroy them. They are a great defence for important locations such as places of power.
An enemy wizard is too stupid to see their danger. He will still attempt to occupy a PoP being guarded by a totem, and will be thumped for his trouble. Another two totems cast around the PoP will be even more devastating, surrounding the spellcaster from escape.