Each explorer has a special capacity and could be surrounded by parts of crystals. 

4 points per complete Big Monster

2 points per medal with value of 5,10, -10 points

1 point per Lava tile

1 point per Grassland tile

Starts with one mutagenic monster (counts towards the Ice and 5/7 different tiles medals)

1 point per Mutant monster tile

Starts with one Desert tile (counts towards the Desert and 5/7 different tiles medals)

2 points per Rune monster

1 point per complete crystal

1 point per Mutagenic monster

After choosing your tile, you can put your hand of tiles on your own ship (assuming it's still free)

At the end of the game, before awarding the penalty medals, choose a tile in the discard pile and place i in your exploration zone.