There are a few problems with all of the Eldar skimmer units at the moment, so let's go through them:
Underperforming Durability Upgrades:
Eldar vehicle durability upgrades give an effective 18.75% durability increase to Sky Portal units instead of the expected 45%.
- Change health/shield values from 75%/25% to 40%/60% for all Eldar skimmer units; or
- Change Eldar durability upgrades to apply to both health and shields and have the same percentage as SM/Ork upgrades
Vypers are generally worthless until you acquire 4-5 of them thanks to their low damage output. Their slow bombs also don't add much utility since they require the Vyper (likely your squishiest unit) to be in front of your army. However, increasing their damage output may make them unstoppable thanks to their speed.
- Reduce Vyper cost from 125/125 to 100/100; and
- Increase Slow Mine ability range from 8 to 15
The Fire Prism:
Following a common theme, the Fire Prism does poor damage. Its main beam deals 275 AP damage per shot and fires every 11 seconds at range 80, with the explosion doing 100 normal damage in an 8-radius AOE. For comparison, a Big Trakk fires roughly every 5.5 seconds at range 40 and does 300 AP damage with a 3-radius AOE in direct fire. In indirect mode it fires every 8 seconds at range 100 doing 275 AP damage in radius 4, with half damage out to radius 8.
If that sounded like a jumble of numbers, a single Wraithguard model (there are three per squad) fires faster and does 200 AP damage. The Fire Prism is also the most expensive line unit in the game, moves slower than a Predator without FoF, and takes skimmer bonus damage.
- Increase Fire Prism main beam damage from 275 AP to 660 AP (60 DPS)
The Fire Prism is designed as a high-rish, high-reward unit. It's easy to destroy when surprised, needs to prioritise targets carefully due to its long reload time, and, as previously mentioned, is expensive. It should do the damage to match. This change should also give Eldar a reason to use non-Wraithguard anti-armour units.
I'm not as sure of these changes as I'd like to be (the Vyper changes especially). What do you think?