Arena tooltip misleading
The French translation for the arena pit suggests that throwing a prisoner in gives all spectators a massive XP boost.
After a few testing, it's incorrect : everyone hitting the prisoner get a lot of XP (50 per hit for a level 1 gnarling, which is massive), but they only get the XP bonus if they kill the prisoner (which seem to be around 70-80% of what torturing the prisoner and extracting his soul would give).
Spectators still only get the minimal amount of XP they'd normally get from watching.
Game Version:
Steam Public
Platform:
Windows
Also, it's unclear if killing a prisoner gives all minion the XP for defeating him, or if it's just for the one giving the coup de grâce.