Alan
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This is how that rune works. During battle, a unit can restore 40% of its health permanently. (until it is killed again)
If it were that easy... no, there's a small clarification: it restores 40% of the UNITS KILLED in battle (for example, if you have 10 units in a unit and 3 are killed, it will restore 0-1 unit... but if it were 40% of the entire unit, then it would be overpowered).
Тьма - это то, что позволяет смертным не забывать, как ярок бывает свет.