Get Battlesphere castable by monsters.

Right now, the extent of this is player ghosts, but it should make
fighting conjurer ghosts just a shade more interesting.

Currently battlespheres cast by monsters don't time out by elapsed time
(they still disappear due to expending charge). This could probably be
done in a few ways if necessary (a monster enchantment similar to the
player's duration setting, or using something to ENCH_SHORT_LIVED or
ENCH_SLOWLY_DYING on the battlesphere itself). This may not be necessary
(xref: monster IOOD not dissipating except in specific cases), besides
which it would be good to have any decay consistent between the monster
and player cases.

1 files changed, 5 insertions, 4 deletions

diff --git a/crawl-ref/source/spl-summoning.h b/crawl-ref/source/spl-summoning.h
index 88df705fd9..741a186efc 100644
--- a/crawl-ref/source/spl-summoning.h
+++ b/crawl-ref/source/spl-summoning.h
@@ -82,10 +82,11 @@ spret_type cast_haunt(int pow, const coord_def& where, god_type god, bool fail);
 spret_type cast_abjuration(int pow, const coord_def& where, bool fail = false);
 spret_type cast_mass_abjuration(int pow, bool fail = false);
 
-spret_type cast_battlesphere(int pow, god_type god, bool fail);
-void end_battlesphere(bool killed);
-bool aim_battlesphere(spell_type spell, int powc, bolt& beam);
-bool trigger_battlesphere(bolt& beam);
+monster* find_battlesphere(const actor* agent);
+spret_type cast_battlesphere(actor* agent, int pow, god_type god, bool fail);
+void end_battlesphere(monster* mons, bool killed);
+bool aim_battlesphere(actor* agent, spell_type spell, int powc, bolt& beam);
+bool trigger_battlesphere(actor* agent, bolt& beam);
 bool fire_battlesphere(monster* mons);
 void reset_battlesphere(monster* mons);