Should reinvigorating call be "can't use it on them again until the subject/target finishes a short or long rest"?
To be fair, that's only from 1 table, and it was in the middle of messy "everyone bring your homebrew class" sessions which had all sorts of weird interactions and things going on.
So take it with a grain of salt.
I haven't played 5e in a while, and haven't played a warlord in even longer, but the best warlord version (IMO), was...
Level 1; you can help as a reaction.
Subclasses weapons/armor proficiency
Level 2: before you take a reaction, you can move 5' per Int, up to your speed, in order to get into range.
For each reaction you do not spend, you gain +1d4 to your next attack roll and damage rolls on the following turn.
Level 3: give Cha THP as a minor action.
Subclasses reaction maneuver
5: you gain an extra reaction each turn.
6: helping with a skill gives a min d20 roll of half your warlord level
7: a few reaction maneuvers (push allies/enemy out/in of a fireball, prevent an OA, and some others)
9: don't provoke OA when using reactions.
10: subclass out of combat feature
11: 3rd reaction.
13: a few advanced maneuvers that take 2 reactions (interrupt spell casting, advantage on a save, and more)
14: subclass reaction that takes 2 reactions
15: all allies gain Cha THP as a minor action
17: 4th reaction
18: subclass ultimate
20: help no longer takes an action
Sub-class
martyr (shield, become the target of an attack, 2 reactions to have eveyone in an AoE take disadvantage to saves if you are included)
warlord (2-handed, attacks with allies, 2 reactions to turn an ally attack into a crit)
Medic (1-hands, immediately heal half of the the damage taken, 2 reactions to prevent death)
Shouty-lazy-lord that I had a better name for (bonus skill, can help and manuvers at range without moving, 2 reactions for a group shout)
I haven't played 5e in a while, and haven't played a warlord in even longer, but the best warlord version (IMO), was...
Level 1; you can help as a reaction.
Subclasses weapons/armor proficiency
Level 2: before you take a reaction, you can move 5' per Int, up to your speed, in order to get into range.
For each reaction you do not spend, you gain +1d4 to your next attack roll and damage rolls on the following turn.
Level 3: give Cha THP as a minor action.
Subclasses reaction maneuver
5: you gain an extra reaction each turn.
6: helping with a skill gives a min d20 roll of half your warlord level
7: a few reaction maneuvers (push allies/enemy out/in of a fireball, prevent an OA, and some others)
9: don't provoke OA when using reactions.
10: subclass out of combat feature
11: 3rd reaction.
13: a few advanced maneuvers that take 2 reactions (interrupt spell casting, advantage on a save, and more)
14: subclass reaction that takes 2 reactions
15: all allies gain Cha THP as a minor action
17: 4th reaction
18: subclass ultimate
20: help no longer takes an action
Sub-class
martyr (shield, become the target of an attack, 2 reactions to have eveyone in an AoE take disadvantage to saves if you are included)
warlord (2-handed, attacks with allies, 2 reactions to turn an ally attack into a crit)
Medic (1-hands, immediately heal half of the the damage taken, 2 reactions to prevent death)
Shouty-lazy-lord that I had a better name for (bonus skill, can help and manuvers at range without moving, 2 reactions for a group shout)