Attack Skills have +1 to maximum number of Summoned Ballista Totems
Totems' Action Speed cannot be modified to below base value
1% increased Movement Speed per Summoned Totem 
Watchtowers is a notable passive skill that grants increased totem damage and increased movement speed per summoned totem. It also raises the maximum number of summoned ballista totems by one and enables summoned totems' action speed not to be modified below their base value (e.g. through effects like chill).