Castle for All: The only random arm at the start is Angel

Billions of humans descend on the endless continent, become the lord of the castle, and participate in the fair and just race for hegemony.
At the beginning of the advent, each castle lord will randomly get an initial unit building.
Recruit troops, plunder resources, establish a dynasty, and contend for supremacy among all races!
Lin Yi was surprised to find out.
What he randomly arrived at turned out to be the unique unit building-[Angel Reincarnation Pool]!
Can breed angels!
"Haha, mine is a high-level unit building, you can summon forest elves!"
"Mine is a top-tier unit building, capable of summoning a dark dragon, and eventually reaching the holy rank!!"
"I can summon Golden Beamon..."
Looking at these self-flaunting news, Lin Yi couldn't help but fall into contemplation.
His angels, sacred creatures, unique arms!
The weakest two-winged angel is also a demigod.
The most powerful eighteen-winged Archangel, and a terrifying existence of the main god level.....