Death Knight: Correct the cost of Frost Strike for Frost DKs.

diff --git a/scripts/ovale_deathknight_spells.lua b/scripts/ovale_deathknight_spells.lua
index 005475b..2c5f351 100644
--- a/scripts/ovale_deathknight_spells.lua
+++ b/scripts/ovale_deathknight_spells.lua
@@ -81,6 +81,7 @@ Define(frost_fever_debuff 55095)
 Define(frost_presence 48266)
 Define(frost_strike 49143)
 	SpellInfo(frost_strike runicpower=35)
+	SpellInfo(frost_strike runicpower=20 if_spell=improved_frost_presence if_stance=deathknight_frost_presence)
 	SpellAddBuff(frost_strike killing_machine_buff=0 if_spell=killing_machine)
 Define(glyph_of_dark_simulacrum 63331)
 Define(glyph_of_icebound_fortitude 58673)
@@ -109,6 +110,7 @@ Define(icy_touch 45477)
 	SpellInfo(icy_touch buff_runes_none=rime_buff if_spell=rime)
 	SpellAddBuff(icy_touch rime_buff=0 if_spell=rime)
 	SpellAddTargetDebuff(icy_touch frost_fever_debuff=1)
+Define(improved_frost_presence 50385)
 Define(killing_machine 51128)
 Define(killing_machine_buff 51124)
 	SpellInfo(killing_machine_buff duration=10)