The Tombs of Amascut (ToA) is one of Old School RuneScape’s most accessible raids thanks to its flexible invocation system. This system allows players of all skill levels-whether brand-new to PvM, moderately experienced, or grandmasters-to tailor the raid difficulty to their abilities. However, the very flexibility that makes the raid approachable also makes its drop rates notoriously confusing. Even Jagex has adjusted them multiple times to maintain balance. For players looking to prepare efficiently, it can be helpful to buy OSRS gold to gear up and maximize their performance. In this guide, we’ll clarify the mechanics behind drop rates, the fastest ways to obtain a Shadow, and how to efficiently green-log the Tombs of Amascut.

Understanding Points and Purple Chance

At the core of ToA’s drop system is the point mechanism. Players earn points based on the damage they deal during a raid. These points play a crucial role in determining your purple (rare unique) drop chance. Increasing the Raid Level raises bosses’ hitpoints, which in turn increases your potential points. For example, a solo raid at Raid Level 0 yields around 11,169 points, whereas increasing the level to 150 raises expected points to 15,141-a 35.5% increase.

However, more points do not directly translate to a proportional increase in purple drop chance. Below Raid Level 50, certain purples are unavailable. The game rerolls these drops, making early purples effectively 50 times rarer. From Level 50 onward, items like Lightbearer and Osmumten’s Fang become available, and at Level 150, all purple items can drop. Therefore, even a 35% points increase can result in a far greater boost in actual drop rates due to level restrictions being lifted.

Calculating Purple Chance

For Raid Levels 150 and above, the purple chance is determined by your total points divided by a purple denominator. The denominator, calculated as 10,500 - 20 × scaled Raid Level, decreases as you raise the Raid Level, meaning fewer points are needed for a 1% chance at a purple. When combining increased points and a lowered denominator, purple drop chances increase significantly, especially between Raid Levels 150 and 300. Beyond Level 300, gains begin to slow, but the compounded effect of points and denominator adjustments ensures higher levels still offer better odds.

Solo vs. Group Efficiency

Purple drop chances differ slightly between solo and group raids. Solo raids maximize individual purple probability, while larger groups distribute points, lowering individual chances. However, larger groups complete raids faster, which can equalize purples per hour. For example, a 300 Raid Level takes roughly 23 minutes solo, 22 minutes for two players, 21 minutes for three, and 18 minutes for eight. Consequently, the purples-per-hour metric is largely similar across group sizes, meaning players can prioritize group size based on enjoyment rather than strict efficiency.

Targeting the Shadow Drop

Unlike static drops in raids like Chambers of Xeric or Theatre of Blood, ToA’s item weights are dynamic and scale with Raid Level. Between Levels 150 and 350, Lightbearer and Fang dominate, while Masori items become more likely beyond Level 350. To maximize the chance of obtaining a Shadow, it is optimal to push from Level 300 to 400. Here, both purple chance and the probability of a Shadow increase notably-for instance, the Shadow drop rate rises from 0.177 at Level 300 to 0.451 at Level 500, nearly tripling the odds.

Green-Logging Strategy

Completing the full collection log efficiently depends heavily on Raid Level. Solo Level 150 raids require roughly 1,667 runs to green-log, whereas the extreme Level 600 raids need only 257. Practically, aiming for Level 300 raids is optimal: green-logging requires 792 runs, a substantial improvement over Level 150. Pushing further to Level 500 reduces the requirement to 318 raids, while Level 600 offers diminishing returns relative to the skill and coordination needed.

Conclusion

The Tombs of Amascut reward strategic planning as much as raw skill. Understanding points, purple chance mechanics, and item weighting allows players to optimize their runs, whether solo or in groups. For most players, leveling raids to 300 and gradually progressing to 500 strikes the best balance between challenge and efficiency. Beyond these mechanics, personal damage output remains critical-relying on teammates without contributing significantly will reduce your purple odds. Additionally, acquiring cheap OSRS gold can help you efficiently gear up and prepare for higher-level raids, further increasing your chances of obtaining rare items like the Shadow and efficiently green-log the Tombs of Amascut.