# Teleportationstrank

Request (2026-10-17): the yellow potion becomes "Teleportationstrank";
drinking it opens the window of known portals and the hero can teleport to
one of them.

## Measured

- The yellow potions come in stages (small / medium / large; seen types
  0x1434 and 0x141a), all potion kind 5 (logged in
  cCreature::UseItem 0x54a8f0).
- Touching a teleporter logs `cInterpretSQW::Teleporter(hex=N)` (0x4ae330):
  it sets bit N in the hero's known portals (hero +0x578) and posts a UI event
  (constructor 0x553080) of type 0x39 to `DEFAULT_BUSYDLG` with +8 = 2,
  +0xc = 5 (mode: portals; 6 for underworld portals above 0xd) and +0x10 = the
  mask. cUI_BusyDlg::HandleEvent (0x720c10) calls SetMode (0x720180).
- Choosing a portal: the engine's portal case (0x619671, log `EE_USEPORTAL`)
  teleports the hero with cCreature::Teleport (0x54d840), returning to 0x6197c8.

## Mod (src/mods/teleportpotion.cpp)

- Every item type of potion kind 5 counts. Their names (text 0x428700 of each
  type) are replaced in every game text (`game::ReplaceInTexts`): the item
  names and the bottom bar's quick-select tooltip ("Trank der Konzentration
  [R]", its own text id). The shortest name is replaced, so stage words stay.
- cCreature::UseItem (hooked in itemstack.cpp) asks `teleportpotion::UseItem`
  first: for the hero's Teleportationstrank it posts the teleporter's event
  with the hero's mask instead of the drink.
- The potion is used up (flag, RemoveItem, DestroyObject as UseItem does; a
  stack loses one) only when cCreature::Teleport is called from the portal
  case while it is pending; closing the window keeps it.