Voice of Seren

The Voice of Seren is a blessing effect in Prifddinas, moving between clan districts every hour. Two clans will have the Voice active at any given time. While the Voice is active in a clan's district, certain actions related to that clan's signature skills give additional experience or rewards.

The clans that are receiving the Voice are the same in all worlds. Elven clan capes can be right-clicked to tell whether the Voice is currently active in that clan's district. The Master clan cape can be right-clicked to do the same, but will tell the clans districts for which the Voice is currently active in.

When in Prifddinas, two clan icons are visible on the screen depicting the clans that are illuminated by the Voice of Seren. Since 6 July 2015 one can also hover over these icons to see some of the effects for that clan when it is illuminated. Near the lodestone in the Tower of Voices, the player is able to see which districts the voice is active in by looking at the illuminated symbols on the ground. The clan symbols on the ground indicate the direction where each clan district is located.

Inside Prifddinas, the following message is shown when the Voice of Seren changes districts. The colour depends on which district is mentioned.

Clan	Message
Amlodd	The Voice of Seren is now active in the Amlodd district.
Cadarn	The Voice of Seren is now active in the Cadarn district.
Crwys	The Voice of Seren is now active in the Crwys district.
Hefin	The Voice of Seren is now active in the Hefin district.
Iorwerth	The Voice of Seren is now active in the Iorwerth district.
Ithell	The Voice of Seren is now active in the Ithell district.
Meilyr	The Voice of Seren is now active in the Meilyr district.
Trahaearn	The Voice of Seren is now active in the Trahaearn district.

Randomness of the voice

The Voice of Seren rotates in a somewhat random way with some key restrictions. If a Voice is active in a clan, then there will be a two hour cool-down on that clan having the Voice of Seren again. For example, if the Voice of Seren is on Trahaearn from 02:00-03:00 then the earliest hour the Voice of Seren can be on Trahaearn again is 05:00-06:00.

This means that at the beginning of any hour there are four clans that cannot have the voice on them. Of the remaining four clans that can have the voice, two will be chosen. That being the case, if the Voice of Seren just ended for a clan, there is a 50% chance it will be active for that clan again in exactly two hours.

In this way, if the Voice of Seren just ended for a clan, one can use the 2 hour cool-down to predict the time at which the Voice will be active for that clan again. A good way to check this is with Jagex's Clock on their Twitter page.

After any game update, the Voice can be of any combination, regardless of the voices prior to the update.

Known effects

Icon	Clan	Effects
N/A	All clans	20% extra base experience from pickpocketing the respective workers. An increased chance to find Golden rocks in the respective clan's skill. A chance for a crystal impling to spawn at the herald of one of the affected clans (this can happen multiple times during the illumination).
	Amlodd	20% more base Summoning XP from making pouches and scrolls, as well as creating 12 scrolls per pouch instead of the regular 10. 20% more base Divination XP from converting shadow cores, as well as a chance of chronicles spawning after killing a truthful, blissful or manifest shadow.
	Cadarn	When defeating a Cadarn ranger or magus, 200 Ranged or Magic experience, respectively, is gained, regardless of the combat style used.
	Crwys	20% more base Woodcutting XP from cutting ivy, magic logs, and yew logs. All bird's nest drops are replaced with crystal geode, though this does not require 94 woodcutting. 20% more base Farming XP from planting, checking, and harvesting from the bush, herb and elder tree patches. Crops in the district also have a chance of skipping growth stages. A chance to spawn a Guthixian butterfly when harvesting from or checking the health of crops in the district.
	Hefin	20% more base Agility XP whilst training agility on the Hefin Agility Course. The rate at which velocity is gained on the agility course is doubled. While doing laps on the Hefin Agility Course, an additional 25% of base Agility experience is gained in the Prayer skill for each action performed. Experience boosts, such as bonus experience and the first age set do work. The collector's insignia will not lose charge and won't stack with the Voice. 20% more base Prayer XP from cleansing the Corrupted Seren Stone. Increased chance of the window and light creature shortcuts appearing on the Hefin Agility Course.
	Iorwerth	When defeating an Iorwerth guard or scout, 100 Attack experience and 100 Strength experience are gained, regardless of the combat style used. When defeating monsters in the Rush of Blood D&D, you will gain some Slayer experience from ALL of the monsters.
	Ithell	20% more base Crafting and Construction XP from training using the harps. The harps have a significantly lower chance of losing tune while playing. 20% more base Crafting XP from crafting crystal flasks. Sawmill operator shop stock doubles. It will replenish if it is empty when voice takes effect. 50% chance for each mined soft clay to be transported directly to the player's bank. This effect predominates over a sign of the porter if wearing one. For swings that grant multiple clay the chance is rolled once, transporting all clay received in that swing to the bank.
	Meilyr	20% more base Farming XP from planting and checking the fruit tree patch, and from checking the harmony pillars. Trees planted in the district will have a chance of skipping growth stages. 20% more Herblore XP from making combination potions.
	Trahaearn	20% more Smithing XP when smelting corrupted ore. At the start of the hour, each ore rock, excluding gem rocks, has a 1/15 chance of being replaced by a dark or light animica rock. The replaced rock will remain in the world until the end of the hour. 20% chance to award extra ore when mining rocks in the district. 20% more base Farming XP from planting and checking the tree patch, as well as a chance of the tree skipping growth stages.

Trivia

• An unlisted music track similar to Elven Voice plays throughout the active clans' districts of the city while the Voice is in effect there.
• After the release of Prifddinas, the Voice of Seren gave 20% experience boost for all the clan-related skills performed under the Voice of Seren. This was reduced for some actions to 5% when the second half of the city was released and turned to the current state on 17 November 2014. On the official forums it was told that this wouldn't happen until the first week of December. This was reverted early in January 2015.
• There are 28 states for the pair of clans for a single given hour (8 choose 2). The possibilities for a given hour depend only on the previous two hours, so the Voice of Seren rotation can be interpreted as a Markov chain with 28 states and order 2. Alternatively, the state space can be defined as the set of possible states for two consecutive hours. The number of such states is 420, or 8 choose 2 times 6 choose 2. In this case, the distribution of states for a certain pair of two consecutive hours, such as 05:00 and 06:00, only depends on the state of "the previous consecutive hours," meaning 04:00 and 05:00. In other words, this is a Markov chain on 420 states with order 1. A Markov chain with order 1 is completely characterized by its transition matrix (whose dimension is n by n, where n is the number of states, 420 in this case). The mixing time (a concept which roughly means rate of stabilization) of an order-1 Markov chain is strongly related to the eigenvalues of its transition matrix, in particular, their absolute values. Based on numerical computations and rounding the computed eigenvalues to round values, the 36 largest absolute values of the 420 eigenvalues, in descending order, are exactly 1, ${\sqrt {1/2}}$ 14 times, and $(1/2)$ 21 times. If one stops distinguishing seven of the clans (e.g. considering all clans which aren't Hefin the same), then the 420-state order-1 Markov chain becomes a 3-state order-1 Markov chain with absolute eigenvalues 1, ${\sqrt {1/2}}$, ${\sqrt {1/2}}$. In particular, the second-largest absolute value of both chains are only ${\sqrt {1/2}}$, which suggests that this Markov chain has a surprisingly low mixing time because the clans don't interfere with each other's mixing, and it also suggests a more general fact about Markov chains of this type.
• For quite some time, there was a common misconception that when the Iorwerth Clan district was illuminated by the Voice of Seren, this had an effect on the crystal chest drop table; this was confirmed to be incorrect by Mod Hunter .