I agree with the ideas about a berserker on ranged attack (it's a scary thing, but it doesn't mean that darkness is essential for an elf and perfectly suits them for placement in a guild) and what's wrong with an elf elementalist – let's remember the "Nature" race from the fourth part of Heroes.

Added 8 minutes later
So, when we mention elves, we remember summoning. Maybe we can do something like this – light and summoning + building an "Altar of Sielanna's Wrath" that places a meteor shower and earth shock on levels 4 and 5 of the guild.

Added 2 minutes later
And another question – how did you make the demons lean towards chaos, and the elementalists lean towards darkness – I have a similar idea.