+1 Loot To Forge Enchanting & Runes

What community guides report

1. Guides associate possible rune rewards with Frostbound Tower and describe an Enchant station and item rune slots.
2. Flame, Frost, Poison and Thunder are reported rune types. Exact current effects and costs require the item tooltip; no ranking is established.
3. Sources differ on whether a rune is lost when replaced versus returned when removed. Those may be different actions, but current behavior is unresolved.

Before changing a slot

1. Inspect the target item, existing slot and candidate rune in the current game.
2. Read whether the button installs, removes or replaces and what cost or warning the current prompt shows.
3. Record the result and inventory change before repeating; do not assume a Tower run guarantees a rune.