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# spell\_group\_stack\_rules
`Back-to:World`
**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](#spell_group_stack_rules-group_id) | int(11) | unsigned | PRI | NO | 0 | | |
| [stack\_rule](#spell_group_stack_rules-stack_rule) | tinyint(3) | signed | | NO | 0 | | |
**Description of the fields**
### group\_id
Id of group in [spell\_group](spell_group_2130135.html#spell_group-id) 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:
| 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 | 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 |
| 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.
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