[Daldaen]

Did you not read the first line? It was added as an AA.

Necro AA guide

Feigned Minion
AA cost each level: 3/3/3
Type: Activated, Refresh Time: 10 seconds
Usage: /alt activate 193
Requirements: Level: 61/63/65, Pet Discipline.
This ability allows you to instruct your pet to feign death via the '/pet feign' command. Three ranks of this skill are available, causing your pet to succeed 25%, 50%, and 75% of the time, respectively.
Instant cast. It is subject to the same rules as your own feign death (i.e.. If the pet is being cast on while it feigns death, fd will be broken). While FDed, your pet regens health very quickly. You cannot activate this while you are casting a spell.
Useful for when things go wrong in your farming and soloing and for saving bonechips and time casting new pets for pet pulling if you pull a lot.

2003 Patch

Alternate Advancement:

Lifeburn - This ability would cause an undue amount of aggro to be generated because it would bring the caster to an extremely low number of hit points, making them look like tasty targets to enemies nearby. To lessen this problem, Lifeburn will no longer reduce the caster to 10 hit points, but to about one fourth of the caster's hit points. This should prevent the additional agro generated while retaining the risk for using the ability.
Feigned Minion - The Child of Bertoxxulous pet will no longer cast buff spells to break his feign when under the Feigned Minion effect.