So both the Art of Zendikar & Plane Shift: Zendikar claim there's no way to be sure if Ulamog, Kozilek, and Emrakul are the ONLY Eldrazi Titans out there.

I'm currently working on a D&D 5e Campaign using Plane Shift: Zendikar, and while I'm inclined to use one of the known 3 for familiarity's sake, I'd like some opinions/suggestions: If Ulamog consumes what it can (esp mana) and his lineage 'digests' it for him to pump out spawn or other magical effects (essentially they vomit/poop up spell-like abilities from mana ingested) Kozilek distorts physical reality as well as mental comprehension of reality, and Emrakul warps the minds and bodies of living things into its own image, what say you, would a 4th Eldrazi Titan do?

My only guess on my own is maybe similar to all 3? Harvest mana and regurgitate it as Eldrazi manifestations based on colors of mana? Eldrazi Spirits from W and souls, Eldrazi Illusions from U and people's thoughts/dreams/fears/imaginations, Eldrazi... Avatars? from R and people's emotions and other feelings, Eldrazi Zombies from B and corpses similar to Dead Space's Necromorphs, and Eldrazi insert creatue type here from G and living matter similar to Aliens' Xenomorphs.... idk other than that.

Any suggestions?

an eldrazi whose form and lineage only animates by draining the motion all around, turning everything into utter stillness, sound simply ceasing, not fading, as it hits her range. rain holds fast like infinite frozen crystals in the air, her wastes are inhospitable as the air resists inhalation.

an eldrazi who drains the passage of time, devours experience and aging. when her lineage passes through, the dying are restored to health, then youth, then infancy, then oblivion. the plowed earth becomes whole and rich, then untouched, then bare stone again before the build-up of soil. she returns planes to the original seed, but without any of the potential because it has been unwound and consumed. ironically, her enemies become more hopeful as they become younger, losing wisdom and cynicism.

Though pretty sure Kozilek has done the health-youth-infancy-oblivion thing, but I do like maybe a strange neverending spiral of repeating cycles of time, or mental and physical mazes, go left to go right kinda thing. Or maybe similar to the fictional gag of what happens when character's mindvswap and get mixed up, this Eldrazi could do Time Spiral-esque mana re-arranging, like on Zendikar for instance, blue Kor, green vampires, blue elves, blue goblins, white merfolk, or even a synthesized color like brown, pink, purple, or orange mana. Up is down and down is sideways sort of shenanigans.

I've always broken up the titans along these lines:
Ulamog - Matter/space
Kozilek - Energy/mind
Ulamog - Time... life?

That leaves... not a lot. Order/physics is already kind of covered by Kozilek. Souls? Maybe a titan of nothingness? Space was a stretch on Ulamog, so maybe give that to a new titan?

A titan that stills everything into absolute silence would be neat, yes. Give it a "god of law" feeling against the "god of chaos"-like effects of Kozilek and Emrakul