on the 2nd Level for main campaign, there is a two tile portal south of the core, which I found when building extra treasure space

I'll check second level and see. Could you provide a screenshot? That would greatly help.

It could potentially be the underworld portal.

If you've chosen one of the paths, an underworld portal should spawn after few seconds from the start of the level nearby. If it is not spawning correctly, please let me know and I'll try alternative way to put such portal on the map.

Sinful/unsinful units convert to enemy when restricted.
Ban units completely instead. Because they occupy the population timeframe and population is already handicapped to 1 unit per room per 5 minutes. You can manually disable them before they spawn in, but sometimes they spawn as soon as new room is constructed.

Last home world where you need to fight Pride is bugged to no avail.
Both timers tick 2 seconds/second, when time came, it just kept spamming that it arrived without spawning.

UPDATE: Save/reload stops timer bug.

Restarting a level from scratch fixed the timers.
But now I am softlocked to not being able to leave the home world after defeating Pride, just stuck sending announcement and thats it when I click core.

引用自 Dismellion：

Sinful/unsinful units convert to enemy when restricted.
Ban units completely instead. Because they occupy the population timeframe and population is already handicapped to 1 unit per room per 5 minutes. You can manually disable them before they spawn in, but sometimes they spawn as soon as new room is constructed.

Ban does not work. You can try to restrict unit from portal attraction but player can re-enable them. The moment the required room is built the ''banned'' unit will become attract-able out of gateway.

引用自 Dismellion：

Restarting a level from scratch fixed the timers.
But now I am softlocked to not being able to leave the home world after defeating Pride, just stuck sending announcement and thats it when I click core.

After defeating Pride, you should go to Home Realm where your sins will be ''evaluated'' and corresponding outcome becomes unlocked. After that, 4 outcome levels should become unlocked but only the one should become available based on your choices.

引用自 Dismellion：

Restarting a level from scratch fixed the timers.
But now I am softlocked to not being able to leave the home world after defeating Pride, just stuck sending announcement and thats it when I click core.

Doing a proper restart ( going to main menu first, not clicking restart ) should solve the issue. Restart Option that exists in the game is buggy and may cause many problems.