what build and gear for dungeons?
Depends how you wanna play. Unless you’re pushing the top of the top FotM, then you have a lot of flexibility in what build you want to use.
Do you want something with ranged or melee dps?
In general, for ranged, you’ll want a short bow with at least 20 in marks for Piercing Arrows, 10 in WS for Wilderness Knowledge (to go with Quickening Zephyr), and at least 5 BM for the quickness on pet swap. Outside of this, you have a lot of flexibility, although you’ll want a good bit of investment into skirmishing for your crit (good dps talents in this tree too).
For Melee, go with 1h sword for your primary weapon. You can get by with a greatsword too, but that tends to work better for tankier builds rather than more dps heavy builds. With this, you’ll want more of an investment into Wilderness Survival and Nature Magic so that you can survive being melee, but BM is something to consider with a build like this too since you can increase your dps through your pet while increasing your defense through better healing. The 1h sword also puts might on your pet with the 1 attack, so it synergizes well with it as well.
Runes/Sigils depend on your build.
For dungeons, I would suggest aiming for more direct damage builds rather than condition builds. This is because your group can lose dps on targets if you have too many people applying the same condition. For example, if you put burning on your target, but an ele in your group is also throwing out the condition, your target will likely have a duration of burning that is far longer than you need for the kill. Also, because of the way that condition damage is calculated, the person with less condition damage may not be applying much if any damage at all through some conditions.
In an ideal setting, a condition damage build may be able to eek out a bit more dps, but you’ll seldom being in that situation in dungeons, so I would highly recommend going for direct damage.
Hope that helps.