So the Marni Realm for Gahaz Bandits includes the rotation that I've been using for the past week, was surprised. Neither of the two old popular spots are included (Cliff / Main)... but those two spots really suck, imo.
This is where I grind there, red dots is the path. Character indicator is where you can keep your mount (empty wooden platform), perfectly safe unless a Shadow spawns nearby, then its adds will aggro on the mount usually.
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Location on world map:
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The Marni Realm includes a big chunk of the area to the North-North-East.
I think the Shadow spawns (the old Elites of the area) are kinda buggy in that the adds which they spawn can just not spawn, or spawn all at once. If you take your time in killing the Shadow, you can get around 50 adds to spawn (this was my count on the 3 times I let the fight last). Not sure if related, but two of those 3 times, I had another Shadow spawn immediately afterwards.
These have been my grind sessions:
Grind Tracker | Garmoth.com - BDO Companion
The bottom two both had Ancient Weapon Invasions in one or both hours. I used a Coin for 1hr during each of those two sessions, none since. Those Invasions sure give a boost to total silver, and I haven't had one at all since then. Really simple grind that any Season character can do and make billions while the Season lasts, best spot imo unless you're a zoom zoom class at Centaurs. Though I'm hearing the Fogans can get nice silver as well now, but haven't tested it myself.