Mysterious emblem

A mysterious emblem is received upon killing an assigned target in the Bounty Hunter minigame. The Tier 1 version can also be obtained by killing various Wilderness bosses on World 318, the official Bounty Hunter world, or through wilderness slayer assignments, but to upgrade it players must still participate in the minigame.

Once players kill their bounty target, they will have a chance, dependent on the target's combat level, of receiving a tier 1 emblem in addition to what their target risked. Emblems can be traded in at the Bounty Hunter Store to purchase rewards from the shop, or kept in the hope of upgrading them.

Tiers and upgrading
There are 10 tiers of emblem with increasing values. Once a mysterious emblem is obtained, players can either trade it in to the Emblem Trader for points, or upgrade the emblem by killing more targets.

The points granted depend on the tier of the emblem:

Death
Emblems are always lost upon death, so players will have to be willing to take on a loss to upgrade them. If a player is holding multiple emblems, only the highest tier emblem will be upgraded.

A mysterious emblem will be downgraded one tier as they are dropped on death. For example, if a player is killed and had a tier 9 emblem in their inventory, the victor will obtain a tier 8 emblem instead.

Dropping monsters
The following monsters only drop the mysterious emblem on a slayer assignment given by Krystilia. If the listed bosses (excluding Chaos Elemental) or demi-bosses are not being slayed on a slayer assignment given by Krystilia, they can only drop the emblem on World 318.

The drop rate of an emblem from a Wilderness slayer task depends on the amount of hitpoints a monster has. The exact formula is $$\frac{1}{155 - (hitpoints/2)}$$.


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Trivia

 * Prior to an update on 2 March 2017, mysterious emblems followed a different monster drop rate: Wilderness bosses had a 1/12 drop rate, while the demi-bosses had a 1/50 drop rate. The same update also made the tier 1 emblem tradeable on the Grand Exchange.