Board Thread:Questions and Answers/@comment-25103822-20140904014031/@comment-24908983-20141029100317

Cost efficient daemons are daemons which have lower spirit requirment or more are more effecient (high attack, but low spirit rq). For example in a tower event many people have low cost teams with daemons like kotetsu in it to beat the weaker WG/GG instead of having a full team which will cost more spirit.