How to learn Forbidden Sigils
The following manual supplies the book unlock for ranks marked “Manual unlock” in the rank table. Skill points and time are spent when you purchase the rank. See the skill book guide for manual requirements and planning examples.
Expand Witchcraft slots after Unnatural Resilience
Forbidden Sigils increases Witchcraft Ability slots from two at rank 1 to three at rank 2 and four at rank 3. The numbers are the total slots available at each rank, so rank 3 gives four slots rather than adding four new slots on top of the earlier ranks.
Unnatural Resilience is the prerequisite. Rank 1 has no manual requirement, while ranks 2 and 3 require Forbidden Sigils Manual. All three ranks cost four skill points and three time segments in total, and Aether Flow is the next skill in this branch.
Use the extra slots only after checking which Witchcraft Abilities you actually want equipped. The perk changes loadout capacity; it does not increase an ability’s damage, duration or Health cost by itself.
Rank effects and learning costs
Costs are shown for each rank. Totals include this skill’s ranks only.
| Rank | Effects | Skill points | Time segments | Unlock requirements |
|---|---|---|---|---|
| 1 |
| 1 | 1 | — |
| 2 |
Replaces rank 1. | 1 | 1 |
|
| 3 |
Replaces ranks 1, 2. | 2 | 1 |
|
| All 3 ranks | 4 | 3 | ||
Prerequisite skills
Learn the following skill before Forbidden Sigils.