Heretic II Abode
Ogle: The Return of Morcalavin
a single-player add-on
The Heretic Fortress (THF)
a multiplayer mod
The makers and distributors of Heretic II.
Heretic Hides for technical assistance, early testing, the Ogle player
model, hydra and spider models, the grappling iron model, and a number of prefabs found on his site.  His website is very helpful in how to design an H2 SP add-on, in case you may want to someday (though I suspect Ogle is the last of its kind).
Leprechaun for the jail cell, skinning, storylining and testing.
Talon for giving the Ogle daggers, for the rain and snow effects and for the grappling iron (coding). He is the creator of T-Mod, an expansive library of multi-purpose add-ons for H2.
Sarah Williams for voicing the High Priestess of K'chekrik.
Rick Walters for voicing the Fairburian.
Those whose textures and skies I may have used and/or altered whom I've not accredited here.
The characters Corvus, Morcalavin, Siernan and the High Priestess of K'chekrik are creations of Raven Software (1998).  The Ogle: Return of Morcalavin Heretic II add-on is distributed by amwilliams.com, a personal website of Alan Michael Williams hosted by 1&1 Internet, Inc.  I am not affiliated with Raven Software, Activision or ID Software in any way.
The Ogle: Return of Morcalavin Heretic II add-on is provided free, "as is," without warranty of any kind.
For more screenshots, visit the game's Raven-games.com forum thread.