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# spell\_group\_stack\_rules
[<-Back-to:World](database-world.md)
**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 | UNSIGNED | PRI | NO | 0 | | |
| [stack\_rule](#spell_group_stack_rules-stack_rule) | TINYINT | SIGNED | | NO | 0 | | |
| [description](#description) | VARCHAR(150)| | | NO | | | |
**Description of the fields**
### group\_id
Id of group in [spell\_group](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 SpellGroupStackFlags in core:
| Id | | Stack Rule Name | Description |
|-----|-------|----------------------------------------------------------|--------------------------------------------------------------------------|
| 0 | 0x00 | SPELL\_GROUP\_STACK\_RULE\_DEFAULT | No stacking rule defined - placeholder |
| 1 | 0x01 | SPELL\_GROUP\_STACK\_RULE\_EXCLUSIVE | Auras from group can't stack with each other |
| 2 | 0x02 | SPELL\_GROUP\_STACK\_FLAG\_NOT\_SAME\_CASTER | |
| 4 | 0x04 | SPELL\_GROUP\_STACK\_FLAG\_FLAGGED | |
| 8 | 0x08 | SPELL\_GROUP\_STACK\_FLAG\_NEVER\_STACK | |
| 10 | 0x10 | SPELL\_GROUP\_STACK\_FLAG\_EFFECT\_EXCLUSIVE | |
| 20 | 0x20 | SPELL\_GROUP\_STACK\_FLAG\_MAX | |
| | | // Internal use | |
| 100 | 0x100 | SPELL\_GROUP\_STACK\_FLAG\_FORCED\_STRONGEST | |
| 200 | 0x200 | SPELL\_GROUP\_STACK\_FLAG\_FORCED\_WEAKEST | |
### description
A short description of what type of spells are in the group and what rule is applied.
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