I have been camping this mob for a day now and it has yet to spawn. killing a mix of bats, a pustlant cadavars , and a skeletons. That caused every other named to spawn at least once if not more in malign and blightfang's case. So i am ether very unlucky or this is gonna take a while. will post more when i get him.
So far just today i have killed over 39 A whiskered bat. I have been camping this mob on and off for 3 days. I have also killed 20 An infected bat. I have never seen him on track. Neither on my rangers track or druids track. EDIT: Add 13 more A whiskered bat. EDIT: Add 17 more A whiskered bat. Also add 10 more An infected bat. Oddly i read a post under a gravid fire beetle by Shuraz that said he went around killing skellies as he put it to get various different named mobs to spawn. I only got The Crimson Bat to spawn after i tried doing that. I went around killing A skeleton on my rangers track. I saw The Crimson Bat within minutes after clearing all the A skeleton on my rangers track. I also saw that Malign had spawned but i was not after him and not surprised to see he spawned either. This was around 2am game time.
He's not literally red, but he's got a more red tincture to him than the other bats. Found him via nearest target cycling and couldn't figure out where he was until I decided to quit looking for his target and start looking for his color =)
i engage it with a root (cant be rooted/snared fyi) and the wisps and animals around it start to attack it, i ran thinkin they were all comin after me but i noticed the bats hp were droppin and nothin was behind me, so i run back and see them all slappin the bat up. i start nukin like crazy to not get ks'd by the animals and i get xp. dropped the earring and a batwing.