Just as an example. This one is based on Charisma. Other subclasses would use different scores.so what subclasses would people give the warlord? what would their specialisations be? the ones that immediately come to mind for me would be:
maneuvre use focus
martial combat focus
1/3 caster support
You are a tough but reliable commander who expects the best from your allies, but never more than you'd give yourself. You put your own neck on the line to maneuver your squad into the best position, trusting them to seize the opportunities you provide.
Squad leader - Level 3
You gain proficiency with heavy armor and all martial weapons (this assumes the main class is changed to have a limited selection), and you gain proficiency in one of the following skills: Athletics, Deception, Intimidation, or Persuasion.
You then gain Expertise in one of these skills of your choice with which you're proficient.
Risky Reward - 3rd Level
When a creature misses you with a melee attack and doesn't have advantage against you, you can use your reaction to grant that attacker advantage against you until the end of that creature's turn.
If the creature's attack still misses, you gain temporary hit points equal to your Warlord level + your Charisma modifier. If the attack now hits you, the attacker provokes an opportunity attack from one ally of your choice that can see or hear you, and who has the attacker within their reach.
Divert Attention - 3rd level
When you use a Maneuver to augment an attack, you can choose to mark that attack's target until the start of your next turn. While marked, the creature has disadvantage on attack rolls against any creature but you. Then, choose one creature you can see within 30ft of you; that creature has advantage against the target while it is marked by you.
Come and Get Some! - 6th-level
When an ally in your aura makes a damage roll against a creature within 5ft of you, that ally can reroll any dice that show a 1 or a 2, but must use the new result. If you have half or less of your hit points left, your ally can also score a critical hit on a natural 19 or 20.
I'm Just Getting Started! - 10th
The first time during each combat that you drop below half of your hit point maximum, you and each ally within your aura gains temporary hit points equal to your Warlord level + your proficiency bonus and each of you gains a +10ft bonus to speed until the end of your next turn.
Final Gambit - 14th level
When you would be reduced to 0 hit points, you can choose to drop to 1 hit point instead. Until the end of your next turn, each of your allies who can see and hear you gains a bonus to AC, all d20 tests, and to damage rolls. The bonus is equal to your Charisma modifier. In addition, each ally can score a critical hit with a weapon or spell attack on a natural roll of 18-20.
Once you use this feature, you must finish a long rest to use it again.