Back in the day when I was playing Rolemaster twice a month, I played an Astrologer. To me, the Astrologer is a good example of everything good about Rolemaster. Let me explain.
The Astrologer is a hybrid spellcaster mixing Channeling (what Clerics use) and Mentalism (sorta' like psionics). So it is, in a way a multi-class cleric/psionicist for magic-user/cleric. Another hybrid Channelling/Mentalism class is the Healer.
The Astrologer has some great 'base spells' (or 'primary class spells') that allow them to communicate over vast distances, use some precognition, do a lot of cool tricks with lights, etc. This makes them an interesting mix of diviner and minor illusionist. They can also throw in a broad range of minor healing spells, invisibility, etc.
But very few attack spells. They also couldn't wear a lot of armor and they could, potentially, be OK in combat with a single weapon. Maybe.
But everyone in the party wanted the Astrologer along. In addition to being a decent backup healer he was also really good at things like 'no, there is a troll that way' and 'that stair leads back to the surface' and 'don't touch that, it is cursed'. And the Far Voice spells were great for talking between people hundreds of miles away, Really Big Deal in any pseudo-medieval setting!
The Rolemaster Unified playtest is a ton of fun and we re enjoying it immensely. But since it is a playtest they are sticking to the core professions. So - I made my own RMU version of the Astrologer:
This is a bare bones version, but complete enough to play in the playtest!
Anyone have their own favorite profession they;d like to see return?