. ▁ ▁Games ▁ ▁The ▁A ver num ▁games ▁take ▁place ▁largely ▁in ▁a ▁sub ter rane an ▁world ▁known ▁as ▁A ver num . ▁The ▁main ▁cl ash ▁of ▁the ▁game ▁is ▁between ▁the ▁A vern ites ▁and ▁the ▁surface ▁kingdom , ▁known ▁as ▁the ▁Empire . ▁ ▁The ▁game ▁features ▁several ▁races . ▁The ▁humans ▁are ▁the ▁dominant ▁race ▁in ▁the ▁series , ▁with ▁the ▁Ne ph il im ▁and ▁Sl ith zer ikai ▁being ▁two ▁other ▁primary ▁races . ▁Among ▁notable ▁enc oun ters ▁in ▁the ▁game ▁are ▁the ▁V ahn ata i , ▁a ▁race ▁of ▁highly ▁mag ical ▁and ▁al ien ▁cre atures ▁who ▁live ▁in ▁the ▁deeper ▁c aves ▁of ▁A ver num . ▁ ▁The ▁A ver num ▁series , ▁similarly ▁to ▁the ▁Ex ile ▁before ▁it , ▁is ▁dem ow are . ▁The ▁user ▁can ▁download ▁the ▁program ▁for ▁free , ▁and ▁play ▁a ▁significant ▁part ▁of ▁the ▁game ▁without ▁restrictions , ▁until ▁he ▁or ▁she ▁adv ances ▁to ▁a ▁certain ▁point ▁in ▁the ▁story line , ▁at ▁which ▁time ▁he ▁or ▁she ▁must ▁purchase ▁a ▁registration ▁key ▁to ▁continue ▁playing . ▁ ▁A ver num : ▁First ▁Tr il ogy ▁ ▁A ver num ▁ ▁A ver num , ▁the ▁first ▁game ▁of ▁the ▁A ver num ▁series , ▁features ▁a ▁party ▁of ▁characters ▁thrown ▁from ▁the ▁surface ▁world ▁into ▁the ▁sub ter rane an ▁A ver num . ▁Once ▁here , ▁the ▁player ▁disco vers ▁a ▁culture ▁that ▁has ▁formed ▁from ▁the ▁out