| Category | Events |
| Location | any |
| Period | magic induced |
The deadening effect is provoked by excessive utilization of magic within a 50-foot cubic space. It leads to a diminishment of the essential fabric constituting the Web of Magic. Five percent of all deadening effects are irreversible, with even the formidable weave spiders incapable of effecting repairs. This results in the zone exhibiting a perpetual Deadening Effect - Wild Zone, Dead Magic Zone, Zone of Great Magic, Zone of Reduced Magic spanning at least one cubic mile.
For the world Bal-Kriav, the greatest number of deadening effects occurred during the Gulimbor Cataclysm (996 - 1203) when the First Khazarkar Empire's unrestrained magic use spiraled out of control. The regions Gulimbor and Urizigar were hit hardest by the cataclysm, leaving them with a high concentration of these effects.
Deadening Effects can also yield salutary outcomes. The probability of such advantageous occurrences is 20%, resulting in the establishment of either a Zone of Extended Magic or a Zone of Great Magic within the affected region.
On the outermost eastern periphery of the Ice Cap lies a region known as Cubewrack. This area exhibits effects analogous to Deadening Effects, but rather than originating from disruption of the Web of Magic, those found in Cubewrack stem from concentrated outpourings of magic emanating from the Cube of Arcane.
These are general guidelines employed to ascertain when an area becomes subject to the deadening effect. Each mage spell and arcane spell-like ability harnesses the power of the Web of Magic. More potent magical powers draw upon greater magical energy and heighten the risk of a deadening effect. This likelihood is termed the incident value. When defiler magic is involved, the incident value is doubled.
| Spell Level | Incident Value | Incident Value from Arcane Pooling |
|---|---|---|
| 3 | 1 | 2 |
| 4 | 2 | 3 |
| 5 | 3 | 4 |
| 6 | 5 | 5 |
| 7 | 6 | 7 |
| 8 | 8 | 10 |
| 9 | 10 | 12 |
During each round of spell-casting, the Incident Value is accumulated for all spells cast within a 50-foot cubic area (2,500 cubic feet). Once the Incident Value reaches 50, the provided table is consulted to determine the outcome. At the end of the round, the Incident Value resets to zero. Additionally, there is a 2% cumulative chance per round of a weave spider attacking any individual in the area who utilizes magic while performing these repairs.
| Chance | Type of Deadening Effect |
|---|---|
| 0-45% | No effect |
| 46-55% | Wild Zone |
| 56-60% | Dead Magic Zone |
| 61-70% | Zone of Extended Magic |
| 71-80% | Zone of Great Magic |
| 81-90% | Zone of Reduced Magic |
| 91-100% | Cascade |
After a deadening occurrence (46% or higher), weave spiders will be in the proximity, mending the damages. Contingent on the nature of the deadening occurrence (refer to the table below), this process may span from days to weeks.