Sentencing, Judge Norman Wright told the pair: "This was a flagrant abuse of power and a gross breach of trust."
He added: "The room has been described as a cell but it seems to me it was akin to a prison cell from a third world country, not the home of an 11- or 12-year-old living in this century in this country."
More top news
Mainly settled, cloudy and cold by day this weekend. Fog and frost becoming more extensive each night
Leader Paul Nuttall is confirmed as UKIP's candidate to contest Stoke Central by-election following Labour MP Tristram Hunt's departure.
The pair, both aged 16, appeared at Chester Crown Court today in relation to the death of Lee Briggs.