it means another , usually weak account of some player. May be used to play with lower levels , or (negative meaning) to occupy a place at enemies team. It helps to make a kind of advantage over another team and finally win a game.

You can purchase it as usual and get back your crystals tomorrow after servers restart - at least this was promised on Russian forum. Bottom-line - it looks worse than smoky (of the same rate , like shaft M0 looks worse than smoky M0 and shaft M3 is extremely worse than smoky M3) while moving and, seems to me, is worse than Thunder while standing. I, personally, hate this after an old one. Epic fail and total disaster!