Bonus spell damage
- Bonus spell damage is applied to spell attacks only.
- Amounts for Skills are affected by S, the number of  skill points invested in the skill. skill points invested in the skill.
- Note that damage caps apply. That is, if a spell has a damage cap, spell damage modifiers cannot give more damage than the cap.
| Source | Source type | Increase | Duration | Requirements | Notes | 
|---|---|---|---|---|---|
| Mirror of Nitocris | Offhand item | 50% | Always | Level 70 | -5 to the cost of combat spells | 
| Polar Star | Offhand item | 25%+50 | Always | Level 55 | |
| Mento's fleshraker wand | Melee weapon | 25% | Always | Level 9 | |
| karma charm | Accessory | 20% | Always | Level 5 | Increases the effectiveness of reputation-affecting choices. Using skills costs -1 PP | 
| Bowler's Sticky Wicket | Talisman | 20% | Always | +30% Intellect +5 damage absorption -15% defense | |
| Tempest's Brooch | Talisman | 20% | Always | +30% Intellect +5 damage absorption -15% defense | |
| aquamarine ion stone | Accessory | 10% | Always | Level 9 | |
| fall's staff | Melee weapon | 10% | Always | Level 8 | |
| insanely super XL bowl | Accessory | 10% | Always | Elemental | +10% item drops +10% chips drop | 
| The Fire Within | Elemental Passive Skill | S% | Always | Level 14 | 10% + S% max PP | 
| gothy black dress | Full-body suit | 5% | Always | Level 6 | +15% Intellect | 
| illuminum blouse | Shirt | 5% | Always | Level 14 | +5 electric damage | 
| Marty Crouch's magic chest | Offhand item | 5% | Always | Summons 7-11 "magic trick" combat items per day. | |
| Marty Crouch's magic chest (empty) | Offhand item | 5% | Always | Summons 7-11 "magic trick" combat items per day. | |
| UltraSport slacks | Pants | 5% | Always | Level 12 | +20 to maximum PP | 
| Ember in a Bottle | Talisman | .5 x Level | Always | -2 to maximum HP | |
| Crystallizer of Dreams | Offhand item | 50 | Always | Level 40 | 10% physical damage absorption +10% to initiative | 
| enerbun sphere | Offhand item | 20 | Always | Level 12 | |
| illuminum skirt | Pants | 20 | Always | Level 14 | +7 electric damage | 
| Ebon Eye of the Deep | Talisman | 15 | Always | +5% of damage returned as PP -20% chips. | |
| staff of meeting | Melee weapon | 15 | Always | Level 10 | |
| Aura: Mystery | Psion Skill | 2*S + (level/2) | 30 minutes | Level 4 | -1 PP to the cost of combat spells | 
| archron's staff | Melee weapon | 10 | Always | Level 8 | -5 seconds to the duration of each turn | 
| channeling blade | Melee weapon | 10 | Always | Level 5 | for Psions only +10 psychic damage - for Psions only | 
| Gulliver's maul | Melee weapon | 10 | Always | Level 12 | +3% of weapon damage returned as PP | 
| Livia's icicle pendant | Talisman | 10 | Always | +5 ice damage +10% ice resistance | |
| pandimensional scepter | Melee weapon | 10 | Always | Level 9 | -1 to the cost of combat spells | 
| The Murk's Silk Shirt | Shirt | 10 | Always | Level 9 | Using skills costs -1 PP -5 seconds to the duration of each turn | 
| isinglass orb | Offhand item | 6 | Always | Level 4 | |
| number one fan | Offhand item | 6 | Always | +3 PP per turn | |
| Pawn of Destruction | Offhand Item | 5 | Always | Level 5 | +5 weapon damage | 
| ball of fire | Offhand item | 3 | Always | ||
| filigreed foil hat | Helmet | 3 | Always | +3 weapon damage | |
| Starsday | day of the week | 3 | Always | ||
| witch's hat | Helmet | 2 | Always | ||
| Smoldering with Fury | Item | scales with level | 90 minutes | Obtained from rusty brick Melee damage Ranged damage | 
Notes
- Discovering the bonus on Starsday was part of the March 2009 spading bounty.