The Necromancer class is as described in the play test document published by Necrotic Gnome.
A Thief who successfully Backstabs deals 12 + STR mod flat damage.
Fighters (only) gain the Cleave ability: If a fighter inflicts enough melee damage to reduce an opponent’s hit points to zero or fewer, the fighter can immediately attack another opponent within melee range using the same weapon. The fighter can continue attacking new opponents as long as the above requirement is met.
Thieves use the D6 Thief Skills alternate system from Carcass Crawler Issue #1, modified slightly. No skill using this system can ever increase beyond a 5 in 6 chance.
At 1st level, a Thief has 6 expertise points to allocate. Every level thereafter, a Thief gains 2 points to allocate.