Devotion is a threshold Defenceability. When activated, protection prayers and deflect curses reduce the damage of the styles they defend against to 1 for 10 seconds. In PvP, damage is instead reduced by 75%. The effect can be extended by 5 seconds per opponent killed, capped at a maximum total duration of 20 seconds by killing two opponents. Killing multiple enemies at the exact same time only counts as one kill.
Note that some monsters, such as nihil and muspah, ignore the effects of Devotion, even if the correct prayers are used. It is unknown if any other monsters are capable of doing this.
These abilities are individual drops; however, it is possible to receive multiple abilities in a single kill. When received, it is automatically learned; it does not drop as an item. When learned, the message "You have unlocked the Devotion ability!" appears in the chatbox.
Devotion will block the Dharok's "Give me everything!" attack in Barrows: Rise of the Six, where it can save the player from a fatal hit if he was damaged too much while channeling this ability.
Devotion used with Melee protection prayer/curse blocks the Kalphite King's instant kill attack, as well as his magical bombs if protect from magic is used.
Note: Devotion can only defend against melee, magic, and ranged damage, and only if the correct protection/deflect prayer is used. In the event that the player fails to switch to the appropriate prayer in time or if prayers are disabled by an attack such as Smash, Devotion does not have any effect. Typeless damage is likewise unaffected. Receiving attacks from multiple styles at once may also necessitate the use of other defence abilities such as Reflect, as players can only activate one protect/deflect prayer at a time.
For a while after release, the ability gave full protection of that combat style. As of the patch notes of 24 February, 2014, the ability now blocks 75% of the damage in a PvP situation.
When released, Devotion lasted 20 seconds and extended up to 40 seconds. After a hidden update, it was reduced to 5 seconds with a limit of 20 seconds, but due to many player complaints, the patch notes increased the duration of Devotion for 10 seconds.
Originally when this ability was released the cooldown time was 60 seconds. On 24 February 2014 this was changed to 90 seconds. This was later reverted back to 60 seconds with an overall buff to the ability.[which?]