Duke Sucellus OSRS: Setup, DPS and Profit Assumptions

Correct the headline kill rate

Pure target TTK excludes prep, potion creation, movement and respawn time. Those fixed costs matter more as the damage phase gets shorter, so dividing 3,600 by calculated TTK will overstate kills per hour.

The current Wiki money-making model also assumes excellent equipment, maximum combat stats and avoiding unnecessary damage to receive the additional standard-table loot. Adjust the estimate when any of those assumptions are false.

Soulreaper axe accounting

An eye of the duke is not equivalent to immediately banked cash. Its headline value assumes you later obtain the matching rare pieces from three other bosses and assemble the axe. Keep completed-axe value separate from liquid loot when deciding whether the grind funds your next upgrade.

Separate preparation from damage

Duke's encounter has a preparation phase that consumes time before the damage phase begins. Measure the whole loop from entering the room until you are ready for the next kill: gather ingredients, process them, reach the arena, attack, handle mechanics and collect loot. A weapon upgrade changes only part of that loop, so its hourly benefit is smaller when preparation dominates.

Use the calculator to compare the post-quest target under identical stats, then add your measured preparation time. If your damage phase is 70 seconds and preparation plus movement is 50 seconds, a ten percent DPS improvement changes the whole loop by much less than ten percent.

• Select the regular post-quest form for a normal profit estimate; use awakened only for a deliberate challenge comparison.
• Record preparation time over several kills because early attempts are usually slower than a settled route.
• Keep avoidable damage and supply cost in the worksheet even when the DPS number is unchanged.
• Value an eye of the duke separately from cash unless the other axe pieces are already secured.

A simple whole-loop formula

Let damage time be D, preparation and movement be P, and banking or reset time be B. Your repeatable loop is D + P + B, so hourly kills are 3,600 divided by that sum. For example, 70 seconds of damage, 50 seconds of preparation and 20 seconds of reset gives 140 seconds per kill, or about 25.7 kills per hour before failed attempts.

This formula is intentionally transparent. Replace each component with a measured average after you have learned the room. It is more useful than copying a headline rate because it shows which kind of improvement can actually move your result.

Who should postpone the upgrade?

If your route is still changing, your avoidable damage is high or you leave because supplies run out, a weapon upgrade may not be the first purchase. A defensive or prayer upgrade can stabilise the loop and provide more kills per trip. Re-run the comparison once your preparation route is consistent; Duke rewards repeatability more than a one-off fast kill.

Keep liquid loot separate from completion value

For a main account, list ordinary drops, supplies and the expected value of a completed axe in separate columns. For an iron account, list which other bosses must be completed before an eye becomes useful. This makes the opportunity cost visible: a drop can be strategically valuable without being cash that funds the next upgrade today.

Update the model when the quest version, target selection or route changes. A page that clearly states those assumptions is more useful than a higher hourly number with hidden preparation and completion requirements.