RUBBLE AND RUIN

Use this Stratagem at the start of the first battle
round, but before the first turn begins. Select a
ruin or Sector Mechanicus structure on the
battlefield, you cannot select one that is
currently occupied by any models.
That terrain feature is dangerous terrain for
the rest of the battle.
Each time a model Advances or charges
through dangerous terrain, roll a D6; on a 1,
that models unit suffers 1 mortal wound.