Monster Vulnerabilities

Let this thread be used to create a sort of database of Monster Vulnerabilities and Defenses that you have been able to discern through gameplay to help others prepare for their weapon forging effectively, as follows.

Creature                Susceptibility                    Defenses
Manonera (Any)      Cold/Negative Energy        Fire/Acid
Forgies (Any)          Cold                                 Fire Immune
Mountain Giants      Divine                              1 Dmg Reduction against any weapon
Necropolis (Any)      Divine                              Critical Immune
Undead (Any)          Divine                              Critical immune
Skeletons (Any)       Divine/Bludgeoning           Critical Immune
Sendauntra (Any)                                     
Golems (Any)          Lightning/Fire                   Critical Immune
Contructs (Any)                                         Critical Immune
Silosian (Any)          Fire?/Lightning?                Knockdown Immune/Magic Resistance?
Rothe (Any)             Magic/Acid?                      Knocdown Immune/Fire Resistance/Cold Resistance/Electrical Resistance
Fire Elemental          Cold                                Critical Immune/Fire Immune
Fire Giants (Any)      Cold                                Fire Immune
Fire Dragon              Cold                                Fire Immune
Black Dragon                                              Acid Immune
Ice Dragon (Azath)    Fire                                Cold Immune
Dracolich                  Divine                            Critical Immune
Frost Giants              Fire                                Cold Immune
Ice Golems               Fire                                Cold Immune
Cold Cats                 Fire                                 Cold Immune
Ice Wyrmlings           Fire                                Cold Immune
Aquasabats                                                 
Asaibats                                                      
Etc. (let's keep updating this)

Please feel free to add to this post and I will update this list accordingly.