Fossilized lizard amber is not too hard to farm.
4 in the map (5 minute respawn time). 2 of them always spawn in the bottom left of the map, one near the old well, one at village entrance ruins, the other 2 spawns at random area of the map.
I used my thaumaturge to farm it. get 1x2 lizard amber every 60-90 minutes.(no channel hop)