I expanded the Tier 6 creature branch for Inferno.
I added a third level of building upgrade in the city at level 30.

So, what are your Ifrits like? Well, in the classic Heroes 3 style:


And since the Ifrit Sultans have replaced the Abyssal Spawn in this spot, they inherited their feature:


What about the Abyssal Spawn? Where did they go? They moved to the third level of upgrade and now represent an improved version of the Abyssal Lords (they have gained a fire wall in their spellbook, the destructive ray has become expert, reducing armor by 6, and their mana pool has increased from 20 to 26).
I'll say right away that getting the third level of Tier 6 creatures for Inferno will be very difficult. First, you need a city level of 30, and second, they are EXPENSIVE =)

And here are the Ifrit Lords (3rd level of upgrade):

How will the 3rd level affect Multiplayer? Well, if your matches usually end in 4-5 weeks, then it probably won't have any effect. But after that, everything depends on your economic success.