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Enum SpellGroupStackRule in core:
| Id | Stack Rule Name | Description |
|---|---|---|
| 0 | SPELL_GROUP_STACK_RULE_DEFAULT |
...
| No stacking rule defined - placeholder | |
| 1 | SPELL_GROUP_STACK_RULE_EXCLUSIVE |
...
| Auras from group can't stack with each other | |
| 2 | SPELL_GROUP_STACK_RULE_EXCLUSIVE_FROM_SAME_CASTER |
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| Auras from group can't stack with each other when cast by same caster | |
| 3 | SPELL_GROUP_STACK_RULE_EXCLUSIVE_SAME_EFFECT |
...
| Same effects of spells will not stack, yet auras will remain on a target |
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| 4 | SPELL_GROUP_STACK_RULE_EXCLUSIVE_HIGHEST | Only Highest effect will remain on target |
A spell should be in only 1 group with this stack rule.