User blog comment:ThanatosP/Squads, construction - deconstruction./@comment-67.0.218.178-20150917232659/@comment-26957321-20150917233047

Starting from Trial 005 they reduced the % chance of BC/HC drop rate both base and buffed. Check Game play > Special Dungeons/Events > Summoner Research Lab Trial 005 Zevy's 2nd form!