83 SK here. My mage was able to summon the Skull of the Spire Servant from the cauldron and gave it to my 83 Sk,who had his Maladroit minion (lvl 78 pet). I clicked the skull and my SK pet got the buff. Buff was Enhanced Minion I (4h 53m 30s). I haven't taken him out for a spin yet, so no idea how this is going to effect him.
Actually this is the correct focus, this one is from the level 83 mage cauldron. The one you're thinking of is "Shard of the first minion" which is Spire Servant, 45% focus.