All weapons have a catalyst icon in the database and there will be 3 new catalysts (excluding no time to explain) in beyond light and thats: leviathuns breath, heir apperant, and i think malfeasance. Edit: i just checked to make sure and its not malfeasance, its actually deathbringer

I think every exotic weapon should get one. Some of the no-catalyst weapons are pretty mediocre, and after seeing what happened to Trinity Ghoul when it got one, I think a good catalyst could help out a lot of these weapons. Here's what I would personally like to see: Arbalest: Hits instantly break energy shields (even with Match Game on). Wish-Ender: Kills greatly reduce draw time. Chaperone: The Roadborn now activates on precision hits instead of precision kills. Malfeasance: Embedded slugs will seek out other enemies on the target's death. Last Word: Temporarily increases hip-fire precision damage after a kill. Thorn: Remnants track to you faster and from farther away. Picking up a Remnant heals you. Bastion: Increases mag to 6. Kills add additional shots to the next burst. Monte Carlo: Markov Chain increases melee damage (20% per stack). Traveler's Chosen: Gathering Light stacks now increase range. Consuming stacks heals you (more stacks=more healing). Wavesplitter: Power level can now be selected by holding reload. Low power has no recoil and high range. Medium power has medium range and has increased precision damage. High power has reduced range but pierces targets. (I remember seeing this idea somewhere on the forums and I thought it would be really cool.) Jötunn: Increased blast radius. The fire AoE lasts longer. Le Monarque: Precision kills leave behind a poison cloud. Tarrabah: No longer loses charge when switching weapons. Kills while Ravenous Beast is active increase its duration. Divinity: Penance activates more often. Devil's Ruin: Hits with regular shots increase the damage of the next laser (stacks up to 10x, 10% damage per stack). One Thousand Voices: +1 to reserves. Increases duration of beam. Two-Tailed Fox: Adds a third Arc rocket that deals low damage, but blinds enemies in a large radius. Queenbreaker: Hold reload to swap between scopes. Marksman sights further increase range and damage. Combat sights further decrease charge time and handling. Thunderlord: Multikills return ammo to the magazine. Anarchy: Arc traps link together from farther away. Truth: Rockets deal more damage the farther they travel. Deathbringer: Orbs split in two as they descend. Xenophage: Increased stability. Hits apply a burning effect to enemies. Leviathan's Breath: Faster draw time. Leviathan's sigh pushes enemies farther. Heir Apparent: Increases range, stability, and precision damage while stationary.

Malfeasance catalyst makes slugs explode after 4 instead of 5 and your fireteam members slugs count

I just wish all exotic weapons had them, sure some don't really need anything really added (arbalast and jotunn come to mind), but orbs of light on multikill is nice to have

Personally I'd like to see a new telesto, jotunn, bastion, merciless catalyst.

Malfeasance does need something, considering the quest was tougher than many weapons that are much better. It would help if it had superior range. I know the explosive rounds kill at any range, but in pve it's not useful if it takes 5 rounds to kill an acolyte at any reasonable range.