//===== rAthena Documentation ================================
//= rAthena Skill Requirement Reference
//===== By: ==================================================
//= rAthena Dev Team
//===== Last Updated: ========================================
//= 20140719
//===== Description: =========================================
//= Explanation of the skill_require_db.txt file and structure.
//============================================================

Structure:
SkillID,HPCost,MaxHPTrigger,SPCost,HPRateCost,SPRateCost,ZenyCost,RequiredWeapons,RequiredAmmoTypes,RequiredAmmoAmount,RequiredState,RequiredStatuses,SpiritSphereCost,RequiredItemID1,RequiredItemAmount1,RequiredItemID2,RequiredItemAmount2,RequiredItemID3,RequiredItemAmount3,RequiredItemID4,RequiredItemAmount4,RequiredItemID5,RequiredItemAmount5,RequiredItemID6,RequiredItemAmount6,RequiredItemID7,RequiredItemAmount7,RequiredItemID8,RequiredItemAmount8,RequiredItemID9,RequiredItemAmount9,RequiredItemID10,RequiredItemAmount10,RequiredEquipment

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SkillID: The ID of the skill. (See \db\[re|pre-re]\skill_db.txt for more details)

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HPCost:	Amount of HP needed to use the skill.

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MaxHPTrigger: Player's HP has to be below this % of Max HP, in order to use the skill.

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SPCost: Amount of SP needed to use the skill.

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HPRateCost: If more than 0, it's a percentage of the player's current HP. If less than 0, it's a percentage of the player's Max HP.

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SPRateCost: If more than 0, it's a percentage of the player's current SP. If less than 0, it's a percentage of the player's Max SP.

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ZenyCost: Amount of Zeny needed to use the skill.

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RequiredWeapons: Player needs to equip this type of weapon, in order to use the skill.
	0: bare fist
	1: Daggers
	2: One-handed swords
	3: Two-handed swords
	4: One-handed spears
	5: Two-handed spears
	6: One-handed axes
	7: Two-handed axes
	8: Maces
	9: Unused
	10: Staves
	11: Bows
	12: Knuckles
	13: Musical Instruments
	14: Whips
	15: Books
	16: Katars
	17: Revolvers
	18: Rifles
	19: Gatling guns
	20: Shotguns
	21: Grenade launchers
	22: Fuuma Shurikens
	23: Two-handed staves
	24: Max Type
	25: Dual-wield Daggers
	26: Dual-wield Swords
	27: Dual-wield Axes
	28: Dagger + Sword
	29: Dagger + Axe
	30: Sword + Axe
	
Example usage of multiple values = type1:type2:type3
Maximum multiple value is 30.

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RequiredAmmoTypes: Player needs to equip this type of ammo to use the skill.
	1: Arrows
	2: Throwable daggers
	3: Bullets
	4: Shells
	5: Grenades
	6: Shuriken
	7: Kunai
	8: Cannonballs
	9: Throwable Items (Sling Item)

Example usage of multiple values = type1:type2:type3
Maximum multiple value is 9.
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RequiredAmmoAmount: Amount of ammo needed to use the skill.

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RequiredState: Specify the 'State' required to be active, in order to use the skill.
none = Nothing special.
hidden = Requires hidden status by using Hiding, Cloaking, or Chasewalk.
riding = Requires the player to ride either a Peco or a Dragon.
falcon = Requires a Falcon.
cart = Requires a Pushcart (For renewal, this state can be replaced by SC_PUSH_CART in 'RequiredStatuses' field).
shield = Requires a shield equipped.
recover_weight_rate = Requires to be less than 50% weight.
move_enable = Requires to be able to move.
water = Requires to be standing on a water cell.
dragon = Requires to ride a Dragon.
warg = Requires a Warg.
ridingwarg = Requires to ride a Warg.
mado = Requires to have an active Mado.
elementalspirit = Requires to have an Elemental Spirit summoned.
peco = Requires riding a Peco.

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RequiredStatuses: List of status needed to be active, in order to use the skill.
Example usage of values = SC_STATUS1:SC_STATUS2:SC_STATUS3 (see db/const.txt for more details).
Maximum multiple value is 3. (Refer to skill.h: MAX_SKILL_STATUS_REQUIRE)
Use any number or SC_ALL to disable status requirements.

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SpiritSphereCost: Amount of Spirit Sphere needed to use the skill.

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RequiredItemID1-10: These items will be used when players use the skill. Maximum of 10 items.

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RequiredItemAmount1-10: Amount of item used when player uses the skill.
0 means the item is required to be in inventory but won't be consumed.
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RequiredEquipment: Player needs to equip these equipments to use the skill. (Use Item ID).
Example usage of multiple values = item1:item2:item3
Maximum multiple value is 10. (Refer to skill.h: MAX_SKILL_EQUIP_REQUIRE)

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Note: On some fields, ":" delimiter means for each skill level, but there are some level dependent check. (Refer to https://github.com/rathena/rathena/blob/master/src/map/skill.c#L14963)