attacking facility/building will not decrease soldiers
choose offensive hero to fight 1v1 battle in ascending order
show flags in MainLayer
add flag concept to hero
adjust element positions in MainLayer
show offensive heroes flag in MainLayer
show defensive heroes flag in MainLayer
add flag factor into damage formula
add continuous attack factor into damage formula
add continuous hits count
redefine count of facility
adjust elements' position in MainLayer
decrease count of skill/clue after move & explore
decrease count of skill/clue after attack facility/building
update version info to v3.6