Skin changes – Sivir as a scantily-clad super-heroine.. Specific in-game changes:

• Model: Major changes for Sivir and new model for her Boomerang..
• New particles: New boomerang particles for Boomerang Blade, Ricochet and her auto-attack..

Skin bio & introduction: – Hailing from Shurima, Sivir is known as the Battle Mistress of League of Legends, and one of the last survivors in the Azir bloodline. Being the last descendant of the bloodline isn’t all, Sivir is also one of the first six champions designed and released for the League of Legends game.

How to get this skin? – The skin is not available for purchase and has been placed in the Legacy Vault (they can still be mystery gifted, and only appear in a champion’s information tab if owned). The vault is usually opened for limited runs and this skin can then be purchased in the Riot Store. In my experience it can be rather long between each opening of the Legacy Vault, hang tight!

Worth buying? – Spectacular Sivir is a Legacy vault skin — rarely available and not in the regular store. It includes custom particles. You can preview any skin for free on the PBE server before buying. Learn how to access the PBE here.