The basic abilities triggered while under the effects of Momentum are limited. For melee, only Slice, Dismember, Punish and Sever apparently have a chance of being randomly performed. For ranged, Piercing Shot, Binding Shot, Dazing Shot and Fragmentation Shot are randomly performed. For mage, it appears that only Impact, Wrack, Sonic Wave and Combust are randomly used. The damage of random abilities are not boosted. In addition, any basic abilities in melee or ranged that you meet the requirements for can also be randomly performed. For example, dual wielding two swords enables you to use the ability Havoc. It is worth noting that Momentum will not trigger any basic defence abilities such as Resonance or Anticipate even if a shield is equipped, regardless of combat style.
Momentum was added to the game during the beta stage of the Evolution of Combat in a response to players' need for "a less input-intensive way to grind through long Slayer tasks". It was aimed to give the 'old-style' combat a place after the EoC, yet it must be noted that momentum attacks are notably weaker than ability attacks and are strongly not recommended for PVP.
- 18 March 2013. On 24 February 2014, Momentum was changed into a combat mode, and the ultimate abilities functionality was added.
- Attempting to toggle momentum during a Player-Owned Port random event will give the message "You can't do that while transmogrified into this form."