Remathilis
Legend
I'd still rather have a weak buff each round then a strong buff every once in a while.
Then really lower your expectations.
If a power is each round, we have to assume that it will be "always on" in terms of balance. That is, the party can rely on it every round, since there is no resource being spent to create it.
This leads me back to the Marshal. They had two auras (one minor, one major) that was always active. The minor gave either situations bonuses (bonus to damage when charging) or effected one particular area (reflex save, intelligence checks), while the major gave a very small scaling bonus to bigger areas (DR, to hit, etc). A marshal projects his aura whenever he is alive and conscious, so effectively they were always on when the marshal was active.
An At-Willlord would have to be balanced like that. He isn't granting the Dash action, he's adding +10 ft to movement. He's not using battle-maneuvers, he's granting advantage to Athletics checks. He isn't healing allies, he's reducing the damage they take by a few points each round. He's not giving allies extra attacks, he's giving them d6 bonus to damage. In essence, he isn't creating an effect more powerful than a cantrip or part of a feat. And he still needs some limit on how many effects he can be producing at once.
Not sure it will appease warlord fans, but if you're happy, I'm happy.
I mean, i can already get bless twice per short rest by going cleric 1/warlock 2.
Balancing a core class against an optional multi-class combo is risky; multi-classing can break the game if you try hard enough (which is why its optional).