A simple charm can be used to protect your self from being your soul sucked. You simply think of your happiest memory and say 'expecto patronum'. Your patronus is an animal not particularly your favourite animal ,as mine is a wolf. The animal shall come out of your wand and it shall be blue the dementors can not enter this field ,although dementors have been known to come back after the spell has been cast. The dementors like to affect anyone aspecially the people that have true horrors in the past.