The Mesoamerican Long Count calendar is a non-repeating base-20 and base-18 calendar used by several pre-Columbian Mesoamerican cultures, most notably the Maya. For this reason, it is often known as the Maya Long Count calendar. Using a modified vigesimal tally, the Long Count calendar identifies a day by counting the number of days passed since a mythical creation date that corresponds to August 11, 3114 BCE in the proleptic Gregorian calendar. The Long Count calendar was widely used on monuments.
Background
The two most widely used calendars in pre-Columbian Mesoamerica were the 260-day Tzolkʼin and the 365-day Haabʼ. The equivalent Aztec calendars are known in Nahuatl as the Tonalpohualli and Xiuhpohualli.
The combination of a Haabʼ and a Tzolkʼin date identifies a day in a combination which does not occur again for 18,980 days (52 Haabʼ cycles of 365 days equals 73 Tzolkʼin cycles of 260 days, approximately 52 years), a period known as the Calendar Round. To identify days over periods longer than this, Mesoamericans used the Long Count calendar.
The Long Count calendar is divided into five distinct units:
- one day - kin
- 20 days - uinal
- 360 days - tun
- 7,200 days - katun
- 144,000 days - baktun
Mesoamerican numerals
Long Count dates are written with Mesoamerican numerals, as shown on this table. A dot represents 1 while a bar equals 5. The shell glyph was used to represent the zero concept. The Long Count calendar required the use of zero as a place-holder and presents one of the earliest uses of the zero concept in history.
The Mesoamerican Calendar - Ancient Americas 
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Lol you'd love some of the shit you could pull back in 3.5
Sir Bearington v1.0
Sir Bearington v2.0
There was also Punpun, the Kobold Destroyer of Worlds, the monk that could jump to the moon, the peasant railgun, and endless other unhinged bullshittery that eventually prompted Paizo to create Pathfinder/D&D3.75 to try to fix the madness and make the game playable again.
Oh god there was some feat called Chicken Infested where if you took the utterly useless peasant class you'd sometimes just pull a chicken out of nowhere when you fumbled a roll, and somehow someone leveraged that in to world shattering power. There was also the locate city bomb that let you nuke entire regions remotely with no chance of failure at like level six.
Ahh, here we go. according to the raw you could produce an arbitrary infinity of chickens instantly during your turn. Drown the world in Chickens. Only the gods could hope to stop you.
https://forums.giantitp.com/showthread.php?103915-Chicken-Infested-Build