
Versatility!
A versatile character can arguably be the best henchman-herder, but one can also have a place in groups. Almost every other MMOG provides hybrid classes, and they are known to have a role in groups. GW provides the freedom to have a hybrid build as well, and one such character would have the same role as in any other MMOG.
Hybrids are known to fill out groups, back up other characters, and reduce a group's weaknesses by providing more flexibility. They are not meant to be the best at any single role, but are intended to provide something for any situation. One common hybrid is a healer/nuker, who can nuke when a group needs DPS, and heal when a group needs to play defensively. Another common hybrid is a tank/healer, who tends to be an OT (off-tank), providing a support role while also being able to tank. Other common hybrids are DPS/debuffer, tank/DPS, DPS/nuker, and healer/debuffer.
A group of specialists will be capable, but lacks flexibility. They are likely to experience a wider range of difficulties when facing various encounters. Some encounters will cause trouble for a defensive group, others will cause trouble for an offensive group, and even a balanced group will feel this. The thing is, groups of specialists won't be able to adapt as well as they would sometimes like. That's why one or two hybrid characters can help... They can change their role in response to situations.
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So which characters make the best hybrids? You'll probably have the easiest time with a primary class that is balanced, with decent armor and decent energy. Rangers, paragons, and dervishes will probably be the easiest to play as hybrids, but it's not impossible with other classes.
So what builds would I recommend? I won't recommend anything, because you should do what feels right to you. A hybrid build, more than any other role, should reflect your own strengths. You'll be improvising a lot, so you want to be comfortable with what you're doing. A hybrid that gets confused will not help a group at all.
What flavor should your build have? I would highly recommend that the secondary role requires as little energy as possible. This way you can fulfill your primary role, but also fulfill your secondary role at the same time if necessary. I would also recommend skills that provide useful effects without maxed stats. Contrary to what many will say, maxed stats aren't always necessary. For example, with Apply Poison, who cares how long the poison lasts if you're applying it with every shot for a constant length of time? If an ability isn't intended for damage (such as Disrupting Lunge), but the stat boosts a damage side-effect alone, why spend more points than you need? If you need to spend five stat points for one more second of some effect, is it really worth it beyond a certain point?
Those are all things for you to think about. Stats are important, and you should not spread yourself too thin, but really think about where you need the points. I'd only recommend that your weapon stat is maxed (if applicable)... Everything else is up to you. Try and value the utility of abilities, and not just the numbers behind them.
Lastly, about builds... Don't get too attached to one thing. As a hybrid, you're probably going to need to swap skills depending on the needs of a particular group. There's nothing wrong with improvising, especially as a hybrid, because your build already won't be entirely coherent.
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So what is a hybrid's place in a group? I would not recommend a group full of hybrids, but I see it as a role just like the tanks, healers, and DPS. You're not going to be the hero, but you will make things a lot easier for the group if you know what you're doing. You're a midfielder.
A fighter doesn't want to step back, and a spellcaster doesn't want to be in the front. A ranger or paragon, however, can do either with just one or two blocking skills. A fighter doesn't want to switch targets to heal or do anything fancy, but what about another spellcaster? A secondary healer role can be handled by any watchful spellcaster. What about a fighter that relies on adrenaline... What could you do with the energy? Maybe you'll want to take a look at those persistent skills that reduce energy regeneration, such as Mending, as they won't necessarily hurt your role as a tank. What about other nifty spells such as Well of Blood, which don't require a target switch, and can be used without spending much energy? At least with Well of Blood, even a low level of it can indirectly counter many DoT effects for the tanks. What about minions? You spend the energy between battles, and they can cause enemies to mis-fire nukes and other good stuff in PvE. What creative things can you do with a ranger pet? With practice, you can occupy two mobs for a while. What about interrupting? That can be done with a couple low-cost ranger skills, and good timing. How can a non-fighter effectively tank? Blocking. You may be surprised how well this turns out, one-on-one, against a warrior.
There are a lot of ways to build a hybrid character. Just remember that I'd recommend a primary role which is your main contribution to a group, which is also based on your primary class. Your secondary role is where you can get creative, and you may find some interesting combinations.
In the end, though, it's not your build that is effective... It's you. A hybrid build may appear weird to others, but you know what you're doing with it. Hybrid classes tend to be thinking classes, where your situation could change very quickly in the middle of a battle, and you'll need to know what the group needs the most and what you can realistically provide at the time. Just learn from mistakes and have fun with it! A hybrid can be one of the most fun roles to play.
