docs: add valheim progression note

docs/00 INBOX/valheim progression.md

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+---
+date-created: 2026-09-23 07:13
+---
+
+# Valheim Progression
+
+## Notation & Terms
+| Notation | Meaning                                                          |
+| -------- | ---------------------------------------------------------------- |
+| A <- B   | A can be OBTAINED from/through B                                 |
+| A => B   | A DISCOVERS/UNLOCKS B in-game                                    |
+| A -> B   | A is REQUIRED to make/do B                                       |
+| ![B] A   | Completion objective of B category                               |
+| A @ B    | A is FOUND/LOCATED at/in B                                       |
+| ^ A#B    | A is an alternative method for B                                 |
+| ? A      | Open question about A                                            |
+| x A      | A is prohibited/illegal method                                   |
+| A + B    | A AND B                                                          |
+| A \| B   | A OR B                                                           |
+| \* A     | A is available from the START / has no progression prerequisites |
+| A[n]     | A with game-defined LEVEL/TIER n                                 |
+
+- [farm]: a deliberately constructed setup that repeatedly produces a resource or creature drop more efficiently/reliably than ordinary gathering, though it may require consumable inputs or periodic maintenance.
+
+## Notes
+
+![farm] Greydwarf Farm
+
+Hanging Brazier + Forge[1] + Greydwarf Nest -> Greydwarf Farm
+
+Bronze + Coal + Chain + Forge[1] + Hammer => Hanging Brazier
+
+Bronze{5} + Coal{2} + Chain{1} @ Forge[1] -> Hanging Brazier
+
+Copper + Tin + Forge[1] => Bronze
+
+Copper{2} + Tin{1} @ Forge[1] -> Bronze
+
+Copper Ore{1} + Coal{2} @ Smelter -> Copper
+
+Copper Ore <- Mine Copper Deposit
+
+Copper Deposit + Pickaxe[0] -> Mine Copper Deposit
+
+Copper Deposit @ Black Forest
+
+* Black Forest
+
+Antler Pickaxe -> Pickaxe[0]
+
+Wood + Hard Antler + Workbench[1] => Antler Pickaxe
+
+Wood{10} + Hard Antler{1} @ Workbench[1] -> Antler Pickaxe
+
+* Wood
+
+Hard Antler <- Kill Eikthyr
+
+Summon Eikthyr -> Kill Eikthyr
+
+Deer Trophy{2} @ Eikthyr Forsaken Altar -> Summon Eikthyr
+
+Deer Trophy <- Deer
+
+Deer @ Meadows
+
+Deer @ Black Forest
+
+Eikthyr Forsaken Altar @ Meadows
+
+Wood + Hammer => Workbench[1]
+
+Wood{10} -> Workbench[1]
+
+Wood + Stone => Hammer
+
+Wood{3} + Stone{2} -> Hammer
+
+* Stone
+
+Wood @ Charcoal Kiln -> Coal
+
+Stone + Surtling Core + Workbench[1] + Hammer => Charcoal Kiln
+
+Stone{20} + Surtling Core{5} @ Workbench[1] -> Charcoal Kiln
+
+Surtling Core @ Burial Chambers
+
+Burial Chambers @ Black Forest
+
+Stone + Surtling Core + Workbench[1] + Hammer => Smelter
+
+Stone{20} + Surtling Core{5} @ Workbench[1] -> Smelter
+
+Tin Ore{1} + Coal{2} @ Smelter -> Tin
+
+Tin Ore <- Mine Tin Deposit
+
+Tin Deposit + Pickaxe[0] -> Mine Tin Deposit
+
+Tin Deposit @ Black Forest
+
+Stone + Coal + Wood + Copper + Workbench[1] + Hammer => Forge[1]
+
+Stone{4} + Coal{4} + Wood{10} + Copper{6} @ Workbench[1] -> Forge[1]
+
+Chain @ Sunken Crypt
+
+Swamp Key -> Sunken Crypt
+
+Swamp Key <- Kill Elder
+
+Summon Elder -> Kill Elder
+
+Ancient Seed{3} @ Elder Forsaken Altar -> Summon Elder
+
+Ancient Seed <- Greydwarf Nest
+
+Elder Forsaken Altar @ Black Forest
+
+Sunken Crypt @ Swamp
+
+* Swamp
+
+Greydwarf Nest @ Black Forest