So I recently started the game and have been looking up builds and using the wiki for a lot of information. One necro build i looked up uses the skill Soul Taker. When looking on the wiki it says it's an anniversary skill and I can't learn it from a tome and need an anniversary event to summon the boss. Under the core skill pack in the wiki, it also lists this skill states it can be unlocked and can be learned from an elite totem.
Since this is a PVE only skill, what is the truth on it? Can I learn it from the tome once it's unlocked through the pack or is it unlearnable?