Forge version:
14.23.5.2860

HAC Mod version:
1.12.2-3.7.1

HAC Lib version:
1.12.2-3.7.0

How to reproduce:

1. Install HAC mod and lib. Version info is provided above.
2. Twilight Forest (TF) mod version is 3.10.1013.
3. Equip a certain type of HAC's jewel. The player reported this issue to me has some difficulties in figuring out which type of jewel is needed, but I will try to find that for you.
4. Use TF's Ice Bow to shoot a mob.
5. Game crashes, both client and SMP server.

Log related:
Client crash-report: https://pastebin.ubuntu.com/p/VCWHs5rWgT/
SMP Server crash-report: https://pastebin.ubuntu.com/p/yTSQKxd4QC/
There are some Chinese characters in my mods' file names - they are of no importance.
If they cause any display difficulties, sorry for that.

I have not tested this issue on the latest version for 1.12.2 of HAC yet, and I have no idea about whether it is fixed or not.
So I post this issue for help.
If any other information is needed, please let me know and I will provide it for you as soon as possible.
Thanks to you in advance!

Thank you for your report.
This error is probably happening here.

This is one of the effects of the black badge, and the event is triggered by "a player or mob shooting a projectile at a target".
The black badge camouflages the archer and redirects attacks from other mobs to prevent the archer from becoming a revenge target.

This error appears to be caused by a ticking loop caused by a player with a black badge (probably) being self-harmed by a projectile.
(There are two reasons: this projectile attack didn't have a process to prevent self-harm, and the effect of this badge didn't have a countermeasure against self-harm.)
This error is still present in the latest version.

I found the cause, but I'm currently developing 1.19, and the 1.12 development environment is broken, so I can't fix it.
(The environment has been evacuated to the sub-laptop, but due to corruption, package builds are no longer possible.)
Therefore, there are currently no plans to release a fixed version. I'm sorry.

Thank you for your report. This error is probably happening here.

HeatAndClimateMod/main/java/defeatedcrow/hac/magic/event/MagicCommonEvent.java

Line 113 in 1988bbf

target.attackEntityFrom(DamageSource.causeMobDamage(target), event.getAmount());

This is one of the effects of the black badge, and the event is triggered by "a player or mob shooting a projectile at a target". The black badge camouflages the archer and redirects attacks from other mobs to prevent the archer from becoming a revenge target.

This error appears to be caused by a ticking loop caused by a player with a black badge (probably) being self-harmed by a projectile. (There are two reasons: this projectile attack didn't have a process to prevent self-harm, and the effect of this badge didn't have a countermeasure against self-harm.) This error is still present in the latest version.

I found the cause, but I'm currently developing 1.19, and the 1.12 development environment is broken, so I can't fix it. (The environment has been evacuated to the sub-laptop, but due to corruption, package builds are no longer possible.) Therefore, there are currently no plans to release a fixed version. I'm sorry.

Oh, thanks for such a detailed explanation!
Your kind-hearted help is appreciated all the same.
Wish you a nice day!