I've got a bit of an odd question, and I'm interested to see people's opinions on the matter:
So let's say, for whatever reason, I want to have ogre cavalry. What's an appropriately sized monster that an ogre might ride?
My first thought was actually to have ogre chariots instead, reasoning that they're probably not so much bigger than a human that a team of horses couldn't pull them around pretty fast. But chariots have their own drawbacks, and it occurs to me that it might be cooler to instead put the big monster on top of an even bigger monster, for the sake of intimidation, if nothing else.
Implications in D@W:B in the Chariot section tell me you can use the default Hunter-trained rhinos to pull big chariots. They'd be Irregular Mounted no matter what you do anyway cause you're using ogres.
Why have the mount and the ogre separate? Ogre centaurs are much more fun!
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Honestly, my inspiration for this whole thing is that the word for "tribe" in the Lir-Turkic languages (like Bulgar and Khazar) is "oğur," which sounds a bit like "ogre." Now I can't get the idea of fierce ogre cavalry riding off the steppes out of my head. :P
Creatures can learn 2d4 tricks from a trainer (ACKS pg 58); in L&E, creatures are given a trainability modifier by type to increase that number. Additionally, L&E has optional ability scores for monsters, and a high or low INT will modify that as well, for exceptional individual examples of the type.
All horses get a +1 TM, so they're more likely to hit 2d4+1>=8 - rhinos less so.
L&E has rules for creating monsters as well; so; if you're modeling ogres as a more structured society that can employ cavalry, it's extremely likely they also have animal husbandry, and as such may have developed a mount more suited to their frame and the task - either something derived from a natural animal or something crazier from your own imagination.