Demonology ( talent tree ) Overview . Demonology is the second of the Warlock ' s three talent tree s . It is centered around improving the Warlock ' s minion s , Stones , Stats and survivability as well as the warlock ' s two armor spells . The key talents include Summon Felguard , Soul Link , Demonic Knowledge and Master Demonologist . It is often taken at mid levels ( 40 + ) for Demonic Knowledge which provides a substantial increase in damage before much gear with + spelldmg is available . Advantages . A Demonologist has larger health and mana pools , pets which deal more damage and can soak up more as well access to the infamous Felguard minion , which can be used as a DPS or offtank . Demonologists have much higher spell damage than other Warlocks due to Demonic Knowledge and Demonic Aegis . Their damage is further enhanced in some cases by Master Demonologist . Demonology is a viable tree to use when solo training , with talents such as Soul Link and Demonic Resilience improving the tanking ability of the warlock ' s active pet , as well as reducing damage taken by both demon and master . Due to the large amounts of spell resistance granted by the Master Demonologist effect of the Felhunter minion , as well as the large amount of stamina the demonology tree grants , they are arguably the best caster tanks and are able to generate threat quickly using Searing Pain . The Felhunter ' s Devour Magic and Spell Lock abilities , when used correctly ( in some cases , in tandem with Curse of Tongues ) also make them powerful anti - casters . Demonologists ' stones , if they decide to spec into those talents , are more powerful . The Healthstone heals significantly more , helping in raids . Both the Firestone and Spellstone are arguably more useful than wizard oils and other weapon - applied consumables , and the Master Conjuror talent further enhances them ; the Firestone adds more critical hit rating and the Spellstone adds more haste . Master Demonologist gives the Warlock a high grade of flexibility , offering multiple different effects , depending on the active pet . It allows the warlock to operate optimally in a wide variety of situations , making it possible to reverse a bad situation - - such as a summoned pet near death - - into somewhat of an advantage . A demonology - spec ' d warlock can , through use of Health Funnel and damage - mitigating talents , solo many elite encounters . At higher levels , even some of the toughest non - instanced elites can be soloed with ease using the Felguard or Voidwalker as a tank . Disadvantages . If a Demonologist ' s pet dies , their DPS is greatly reduced , much like a Beast Mastery Hunter . Limited talents for mana efficiency . There are no threat - reducing talents in the tree , although there are talents which allow the pet to generate threat more easily , keeping aggro off of the warlock . Other Notes . One of the best tricks of the Demonology specialized Warlock is to use the Voidwalker ' s Sacrifice ability and then use Fel Domination combined with Master Summoner to summon a new minion in half of a second . After release , it was looked down upon as not being useful , though this opinion is not as prevalent since the addition of Master Demonologist . More recently though , there have been calls by some that Demonology Specialized Warlocks need to be nerfed due to their increased survivability due to the Soul Link talent . However , since then , the Warlock class , and especially its Demonology tree , has undergone major changes . See also . Affliction | Demonology | Destruction