Spell group stack rules tc2

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The `spell_group_stack_rules` table

Table defines if auras in one spell_group can't stack with each other.

Notes: The table doesn't affect persistent area auras stacking or passive auras stacking (they can stack always) or spells belonging to same spell_rank (they are always subject of SPELL_GROUP_STACK_RULE_EXCLUSIVE rule)

Field	Type	Attributes	Key	Null	Default	Extra	Comment
group_id	int(11)	unsigned	PRI	NO	0
stack_rule	tinyint(3)	signed		NO	0

Description of the fields

group_id

Id of group in spell_group table. The spell_group may contain another spell_groups inside, if so stacking rule needs to be defined for these groups separately.

stack_rule

Enum SpellGroupStackRule in core:

• SPELL_GROUP_STACK_RULE_DEFAULT = 0

No stacking rule defined - placeholder

• SPELL_GROUP_STACK_RULE_EXCLUSIVE = 1

Auras from group can't stack with each other

• SPELL_GROUP_STACK_RULE_EXCLUSIVE_FROM_SAME_CASTER = 2

Auras from group can't stack with each other when cast by same caster

• SPELL_GROUP_STACK_RULE_EXCLUSIVE_SAME_EFFECT = 3

Same effects of spells will not stack, yet auras will remain on a target.
A spell should be in only 1 group with this stack rule.