Greek artist (Attica, Athens, Greece) born 29 June 1972, brother of Themis Tolis.
Also known as Necromayhem.

Musician (guitars, vocals, keyboards, bass, drums) best known as the vocalist and rhythm guitarist of Rotting Christ, also songwriter, producer and author.

He has recently produced some of the band's albums and contributed as session keyboardist.[2] Sakis has also provided guest vocals and guitars for a number of bands, for example providing guest backing vocals on the track Mocking Modesty on the Nightrage album Wearing a Martyr's Crown and additional vocals on Spanish North of South's single Just Fourteen Seconds, taken from their The Tides in Our Veins album.

He also played guitar in a black metal band Thou Art Lord, which features members from several other prominent Greek extreme metal groups, such as Necromantia and Septic Flesh.

He used to endorse Grossman custom made guitars. He currently has a signature V-Shaped guitar with the Greek letters ΧΞΣ inlaid in the fretboard. As of 2016 he is endorsed by ESP Guitars and uses an Eclipse model.

In 2018, Tolis announced he was co-authoring a book titled Non Serviam: The Official Story Of Rotting Christ with Dayal Patterson. The book was published in November 2018 and details the history of the band.

A species of prehistoric brittle star, Brezinacantha tolis, was named after him and his brother Themis Tolis.