Specialization skills are a bit complicated, so I thought that I would make a post attempting to explain how to work with them in order to make it easier for people coming into SotA. First, the facts: Specializations have these three states: Training, Maintaining and Unlearning. You cannot set a specialization to Not Training. You can only train one specialization at a time. In other words, you can only set one specialization to Training. You can only have two specializations active at any time. What this means is that you can have one set to Training and another set to Maintaining or both set to Maintaining. All others will be Unlearning. You only get benefits from specializations that are active (Learning or Maintaining). You get no benefits from specializations that are Unlearning, even if you currently have points in them. For combat trees, specialization has no effect on your base attack (auto attack or free attack). The specialization skill itself costs 20x the experience that a normal skill costs, or about 24 million experience to get to 100. You become 100% effective in a specialization at level 80 (~3.6 million experience), so it's not necessary to take it to 100 unless you really want some extra power. Specializations have no effect on innates, only skills that you can add to your combat hotbar. At specialization level 80 you get an extra glyph for every skill in that tree. Having a specialization active will reduce a tree's contribution to decay by 75%. Example: if my Ranged tree contributes 10,000 to my maximum decay and I have Ranged Specialization active, it will then only contribute 2,500 to my maximum decay. NOTE: Even though decay is no longer applied on death, it still applies to obtaining dread artifact reagents. For any magic tree, each point in specialization will contribute 0.2 attunement and subtract 0.2 attunement 0.1 resist from the opposing school. Example: if I have 80 Life Specialization then I will get 16 extra Life magic attunement and loose 16 8 Death magic attunement resist. Most skills get extra bonuses for specialization. The extra bonuses for individual skills are listed in the tooltips for those skills. Right clicking a skill tree and selecting Train All, Unlearn All or Not Train All will not affect your specialization skill setting.  Setting the specialization skills to Training and Maintaining seems to have been made less fiddly in build 742, so the following information may no longer apply. When you set a specialization to Training, it will set all other specializations to Unlearning that are currently set to Maintaining. If you already have another specialization set to Training, it will be set to Maintaining. So, in order to have two specializations active, you will need to do a bit of juggling. When clicking on the arrow, the order goes Maintaining to Unlearning to Training then back to Maintaining. Here's an example using Ranged and Life: Currently, my Life Specialization and Ranged Specialization are set to Maintaining Let's say I want to train Ranged Specialization. I must first set Life Specialization to Training, which will set my Ranged Specialization to Unlearning (this is very unintuitive but is [currently] necessary) Now, if I set Ranged Specialization to Training (one click from Unlearning to Training) then Life Specialization will be set to Maintaining. Be careful not to go past Training or you will have redo the previous step And I'm good to train Ranged Specialization If I want to switch over to train Life Specialization then I only need to set Life Specialization to Training (two clicks, Unlearning then Training) and Ranged Specialization (which is currently set to Training) will be automatically set to Maintaining Now I'm good to train Life Specialization If I want to set them both back to Maintaining at this point then I only need to click once on the Life Specialization arrow in order to set it to Maintaining I really hope that this helps make things a bit clearer.  Please let me know if I missed anything.