There are a few Dragotha sources worth digging into for inspiration:
- from Dragon 134, William Simpson's "Lords & Legends" article
- from Dragotha's Lair, per Falconer's link (a tie-in to Return to White Plume Mountain, which doesn't really use Dragotha directly)
- from the Age of Worms Adventure Path in Dungeon #134 (but the previous two adventures also deal with Dragotha; see
http://en.wikipedia.org/wiki/Age_of_Worms for more details)
Other useful sources:
Dragotha (Dracolich)[NPC]
- DRG#293 - 91
- DUN#77 - 37
- RWPM - 2,8,15,42
- WPM (orange cover) - 3
- Doomgrinder - 11,45
If you like associating Dragotha with the Rift Canyon, there were also some articles about the Wyrmscrawl Fissure that could prove interesting:
Wormcrawl Fissure [PLC]
- DRG#270 - 72,75
- DRG#276 - 84,86,87,89,90
- DRG#293 - 88
- LGJ#1 - 24
- LGJ#3 - 13
- WGR5 - 54
and perhaps these too

Rift {Men of the}(Bandit Kingdom)[KNG]
- DRG#56 - 21
- DRG#63 - 14
- LGG - 29,30
Rift Barrens [PLC]
- LGG - 26,27,29,30,59,102
Rift Canyon {Great Rift}{Riftcanyon}[PLC]
- ATG - 70
- COG:GOTF - 19
- DRG#63 - 14
- DRG#191 - 68
- DRG#270 - 75
- DRG#276 - 84
DRG#293 - 90,91
DRG#294 - 96
- DUN#77 - 32
- FTAA - 21,23,56,62,73,79
HART - 26
- LGG - 17,25,26,28,29,31,61,113,142,154,157
LGJ#3 - 13
- PGTG - 6
- RWPM - 3
- S2 - 2
S2E - 2
- WGA4 - 24
WGG - 25
- WGR5 - 2,21,22,25,44,46,47,48,49,50,51,73,75,86,87,94
- WGS1 - IBC
- WOGA - 59,60
- WOGG - 2,15,30
Riftcrag (Pop 5,000)[TWN]
- COG:FFF - 84
- COG:GOTF - 19
- FTAR#3
- LGG - 25,27,29,30,59,61,154
- LGJ#1 - 28
- LGJ#2 - 28
- SOOC - 7,163
WGG - 25
- WGR4 - 95
- WGR5 - 44,47,49,50,51,53,75,76,81,87,92,93
- WGS1 - IBC
- WOGA - 60
- WOGG - IBC