hugo dos santos heyden

I was playing with my friends, when one of them received a hit and asked to help him getting up, there was a bug in the server and he was disconnected from the party. When he got back, his armors were lost (they were not inside his bag nor with him). They have just vanished from our world. What could we do to solve this problem? Our armors were in level 6 and 7. This was not the first time we face this bug. We have lost a lady bug full set the first time and a full set of pill bug.