Summoning is a skill where 5 teamed players perform a ritual of summoning a demon to fight for one of the players that has been chosen by the demon itself.
You can acquire this skill as a reward from Abe the
The summoning ritual requires an Altar of Summoning in order to initiate the ritual. By activating this Altar, you and the 4 other players on your team will sacrifice your blood (Hit Points) to the demon and a player will be randomly chosen by the beast to become its master.
You will receive an Altar of Summoning on the 4th day of every week as a daily sign in reward for being logged into the game for 1-hour everyday.