just to be nitpicky, because I am not sure how familiar everyone is with DL1 to DL16…
the DL saga goes from DL1 to DL14 (with two of them not being part of it but supplemental info, the saga is 12 modules). DL15 and DL16 are collections of several short adventures. They are not the conclusion of the War of the Lance, which the numbering might suggest.
The one adventure in DL16 is about exploring Soth’s castle. If you are ok with him having a Tarrasque in his basement, run that, but to me DL15 and 16 have nothing to do with the War of the Lance and kinda jumped the shark.
So DL8 (probably 9 actually) - DL14 (defeating the dragon queen) is more the conclusion I would go for, as I suggested above. YMMV