Now I will go through the skills that I am using in the build one by one starting with dps skills. Rubies are mostly just increasing durations and making other skills just a bit better so I wont go through them one by one.
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Acid Shot/Toxic Volley:
Spammable skill that does okay damage per tick, cools down reactor by 40 degrees per shot
Acid Bomb:
One of our the best dps skills and best one to immediatly cool the reactor by 200 degrees. Has a bit of cooldown but this will be used pretty much everytime out of cooldown. Applies a dot on the target that does quite nice damage.
Burst of Mana:
Our most important skill when it comes to dps skills. This skill can be only used with reactor reaches either 200 or –200 degrees. While we have tactics from rubies on, this skill will refresh all buffs on party members. As dps skill, it will apply a dot in a 15 yard aoe radius from your main target with okay damage.
Acid Turret:
This skill is pretty much if acid bomb and burst of mana made a baby. Sooo in short, you will drop down a turret that keeps hitting closest target with acid splashes that do aoe dmg and it stays in ground for 20seconds (increased with rubies) and keeps shooting that whole time every couple of seconds. Cooldown is short enough to have multiple of these on the ground all the time.
Concentrate:
This wont be used in our normal rotations but is still a mandatory skill, does kinda useless amount of damage but dispels positive effects from targets. This is must have skill for some heroics, since mobs/start buffing themselves and we can just yoink their buffs away with this!
Colossus:
Ummh what I could tell about my trusty robot friend Mark..he is pretty useless if I'm being honest. Only needed when some people need locus or when you want just a biiiiit more damage.
Destructive Shots:
Our all mighty gattling gun! By activating this, you will gain god mode while you are rapid firing 8 shots from your gun. These shots are aoe and deal really nice amount of damage in aoe packs or even single target if you want to boost your damage in the dps meter! Cooldown is bit longish and cast time can be lowered by getting more swiftness.
Red Alert:
This skill O.O I still dont know what game developers were thinking when they created this. As short, you will nuke the ground, do way too much dmg as a support, start applying negative effects randomly to targets that its hit while leaving blue cloud on the zone that makes enemies take more damage and makes their HPs sucked off by 1% per second and all allies get 1% more damage every second and max HP while standing in that blue cloudy zone.
And now for the support side of the skills:
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Power/Bloodthirst:
These are our normal buffs that we keep on with burst of mana all the time. Power applies buff that gives 20% more dmg, healing and shielding for 2 seconds (this duration is much longer since we use aspect of support) and bloodthrist gives 350 bloodlust for the duration. When applied also gives 100% more healing for next 5seconds!! These 2 alone make engineers (and bards yes, bards too) really needed everywhere since 350 bloodlust combined with 20% more healing makes anyone almost immortal!
Courage:
This is used before bosses use cc, since this skill applies 5sec immunity for next cc (with the ruby). Without the ruby, this skill only makes cc last less time and like that it would be almost useless in PvE content.
Temporal Acceleration:
Really rarely used skill that gives more movement speed for a short period of time, can be useful when you are trying to get away from sticky situation in heroics.
Critical mass:
Pretty much just gives 25% more dmg to everyone on your party (reactor skill)
/ Iron curtain/Power field:
These skills are your most used shield skills, both have the same purpose, to decrease dmg that your party members are taking. Iron curtain is the more boring one, doesnt do much else but Power field applies slow effect on enemies that go under the bubble it makes on the ground. And while you stand next to it you will get more damage to your volleys (ruby) decreasing dmg from party members and giving you more damage doesn't sound that bad!
Power barrier:
Gives shield 20% shield on everyone and restories 1% of your max hp every second to everyone with the buff. Shield absorbs only 50% of dmg taken so be careful!
Medical emergency aka MEEEEEDICAL!:
As short, aoe puri that is always late when you ask your party members. Purificates negative effect immediately from all party members when dropped.
Shocker:
Pewpew skill that stuns the target for couple of seconds
Paralyzing Ray:
Just a simple long cc without cast time (ruby)… hold on, these boring ones are over soon.
Spider Suppressor:
You will make a spider walk towards an area, on the way it pulls all targets towards the center and disorients them for quite a nice 3 seconds! Wauw.
Steel Trap:
Pulls all targets 15 yards away from main target towards it and immoblizes the main target, so Spider Supressor and Steel Trap are really good for getting aoe mob packs staying in small area for easier clear!
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Wormhole/Teleport:
Put a spotlight for dancing on the ground, when using teleport skill after it, everyone of your party with 15 yard radius will be teleported with you on the spotlight. Using teleport without putting Wormhole down will teleport you alone to the furthest away device that you are used.
Reload:
This skill makes all of engineers device cooldowns reset, except tear skills. Usually used after medical emergency to reset its cooldown straight after.
Sanatorium:
Probly the most bugged skill in whole allods... never gets fixed. But the idea is that you will throw out a massive cannon that starts healing the lowest HP party member on its range 2% per second while giving 35% defence boost. (this cannon is moody, sometimes it just looks at you withtout doing anything and sometimes it heals you to 20% per second depending if it has a good day).
Master Plan:
Simply increases profi/deter/bruta by 70 with really long cd, really good in bosses when party starts bursting!
Racials:
Firecracker:
This is surely the only racial skill everyone should be using! Amazing aoe fear for sticky situations, applies a fire dot that nobody cares about.
For reincarnation skill I would go with: Divine Foresight:
For PvE content this skill is so good just to be able to save the tank from dying! Applies a buff that heals 30% of max HP instantly if the targets HP drop under 30%.