Guild BAM

Guild BAM (Guild quest Rally BAM) is daily event in TERA. Guild BAM spawns once a day. Message is shown to everyone who is member of any guild. BAM spawns soon with another (correct area only) announcement, so you have few minutes to set up raids to kill it. Accordingly Sunflare's guide, GBAM spawns usually between 18:00 to 22:00 (German winter time), except on Mondays, Thursday and Sunday it can spawn from 12:00 to 22:00.

Guild BAMs are level 70 monsters that need a raid to kill. Top 5 raid/party/individual gets rewarded by ranking of damage done to boss. Rewards seem to be gold and Princely / Baronial / Ducal Guild Supplies box, which are same as from CU and have current season enchanting materials. Contents are as of FROZEN season semi-random, but boxes seem to only differ by amount of Bellicarium credits included.

Guild BAMs spawned in Civil Unrest area from 2016 until January 2019. As CU area is PvP-enabled this had special twist in it. Since January 2019 Guild BAMs spawn in Frost Reach or Timeless Woods of Essenia. Current possible monsters are, (Frost Reach) and  (Timeless Woods). GBAMs have same names as old wbosses, however, they are not the same monsters, and old low level wbosses still appear.

Links

 * Guild BAM need-to-knows in TERA EU (patch 79 update) by sunflare, Steam Forums