From the RS lastest offical post,RS Slayer Collection Log has been released in game with the update on September 23th. With the Slayer Collection Log, players are able to keep track of rs 3 gold the drops they get from Slayer monsters.

Obtain RS Slayer Collection Log

The Slayer collection log is a book which can keep track of assorted drops received from RuneScape Slayer monsters. You can obtain RuneScape Slayer Collection Log from any Slayer Master’s shop, or obtain it by right-clicking the slayer counter and choosing the retrieve option.

Titles of RuneScape Slayer Collection Log

The Slayer Collection Log is split between 12 areas. When you complete an area’s collection, you’ll earn a special title:

Asgarnia & Misthalin: , Protector of the Peace
Daemonheim: the Bloodrager
Kharidian Desert: the Devourer
Feldip Hills: the Ascended
Fremennik Province: , the End of All Things
Kandarin: the Well 'Ardy
Karamja: of the Jungle
Keldagrim: the Stout Slayer
Lost Lands: the Harbinger of Death
Morytania: the Scourge of the Undead
Other Worlds: , Gielinor's Champion
Wilderness: , Forinthry's Fury
And should you complete the whole log, you’ll earn the title 'the Ultimate Slayer'.
There will be global broadcasts for the first regular player, the first Ironman, and the first Hardcore Ironman who completes the log.
For those of you who have been informally collecting already, also have good news – any pets and untradeable items that you already own will be checked off automatically upon your next login.

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