I am not too happy about the paragon multiclass path option.
It seems to offer very little for what you could get from the other paths.
My idea to fix it is to add a “synergy benefit” at 11th level for each class combination.
Since there are too many class combinations to invent meaningful benefits, I will restrict this to those class combinations that are actually viable in terms of ability score dependency and power/class ability synergy.
As for the power of the benefit, I’d peg it a bit more useful than a paragon feat and preferably unique.
I’ll need your help to balance things out and find out what combinations are viable.
As example synergy benefits I was thinking about something like the following (the first listed class is the primary class):
Fighter - Ranger
Mobile assault: When charging, you can use one of your at-will powers with the melee and weapon keywords instead of making a basic attack. You get an additional +1 to hit when charging. (I think it is quite fun to be able to use twin strike or cleave with a charge. Lots of fun combos here)
Fighter - Rogue
Confound the enemy: Enemies you have marked cannot make opportunity attacks.
(should be quite fun, maybe some small added benefit is needed)
Fighter - Warlord:
Phalanx fighter: As a minor action choose an ally adjacent to you, you and that ally gain +1 to all defenses and to hit rolls as long as he stays adjacent to you. The bonuses from this ability do not stack, but you may use it on any number of adjacent allies.
Fighter Wizard:
Smart tactics: You can make an additional basic melee attack as a minor action after using a wizard power with the “close” keyword. You can use this benefit twice per encounter (three times at epic tier)
Cleric - Fighter
Protect the fallen: When using a healing power on your ally or using the heal skill or a potion to stabilize a dying ally, you may mark any number of enemies adjacent to him. This is usable only on one ally per action.
(makes for a nice combat medic!)
Ranger Fighter:
Distracting attack: You may mark an enemy that you hit with a ranged attack or a melee attack.
Your allies get +1 to hit an enemy that is marked by you and is the target of your hunter’s quarry. (normal mark, -2 to hit anyone else)
Obviously a ton of these will be needed because I am planning to include all of the viable primary class/secondary class combos. My criteria is mostly that you should not need more than 2 main ability scores and one secondary to make it work. Preferably the classes should then share a primary or good secondary score (Fighter Rogue could have good Dex and Str for example and Cleric Warlord should obviously have good Str and Cha).
Combos that I think are normally viable for multiclass:
Cleric: Fighter, Paladin, Ranger, Warlord
Fighter: Cleric, Rogue, Paladin, Warlord, Wizard
Rogue: Fighter, Paladin, Warlock
Ranger: Cleric, Fighter, Paladin, Rogue, Wizard
Paladin: Cleric, Fighter, Rogue,
Warlock: Paladin, Wizard (high con and int)
Warlord: Cleric, Fighter, Rogue, Paladin
Wizard: Cleric, Warlock
Please critique and propose potential other benefits for some combos!