Welcome to Librarium Online!
So I just puchased a wave serpent for my eldar army. I am thinking about using it so that I can load up my dragons and manuveur them into position. My question is what are worthwhile upgrades? Star engines look nice for the extra speed and vectored engines might help if im unlucky but having both is point heavy. Any suggestions?
Vectored engines: Only good if you move flat out and get immobilized. 5th edition introduced that if you move combat or cruising speed that an immobilized result just forces a landing with no real side effects.
Star engines: Not a bad way of getting tank busters (dragons), or a combat squad close to the enemy (dire avengers/banshees/scorpions). However I don't recommend doing this unless you do it with at least 2 serpents to get more folks up and personal to your enemy. Also keep in mind that to take advantage of this you'll want to move flat out during your movement phase (giving you a cover save) and then the extra star engine movement during your shooting phase. That should get you close enough to your enemy in the next round.
Spirit stones: Don't leave home without them. The Eldar gods don't look to kindly if you do.
Tyranid and Eldar player....don't ask me how I ended up playing these two armies, just smile, nod, slowly move away and don't make eye contact!
What about Holo fields? Combined with Spirit stones and the new 5ed imbolised rules surely they are a must as well now?