Snikt

Any ideas on my second question?
If you slot an Acc/Dam both Mids' Designer and the game's Real Numbers display an increased accuracy - is this a display mistake or does it really have an effect?
Considering it doesn't let you slot a single-aspect Acc enhancement it's inconsistent one way or another.

Does Burn (Fiery Aura) roll to hit?

Mids' Designer and the game's Real Numbers display an accuracy value for it but it doesn't accept Acc enhancements.

If you slot an Acc/Dam for example though both Mids' Designer and the game's Real Numbers display an increased accuracy - is this a display mistake or does it really have an effect?

It seems the info I was missing was:

+0 "75% chance to hit and your powers are 100% effective"
+1 "65% chance to hit and your powers are 90% effective "
+2 "56% chance to hit and your powers are 80% effective "
+3 "48% chance to hit and your powers are 65% effective "

It all adds up now

Yes, +2 and +3 to my (or pet's) level. I don't believe rank affects a player's chance to hit them.

Thanks for the replies

I don't think the clamp comes into these examples because they're always in the 5-95% range.

DSorrow, did you mean defense debuff resistance?
I wondered about that but the examples I ran through didn't give consistent values for the resistance - perhaps I miscalculated though. It would explain why the debuff affected +3s less than +2s.

a couple of worked examples:

1. Melt Armor - defense debuff enhanced to 38.36%

Decoy Phantasm against a +3 with no defense
NetToHit = (1) * (1 + 0) * [ 0.48 + 0 - 0 - (0 - 0) ]
NetToHit = 0.48
which matches what I observed

the same with Melt Armor in effect
NetToHit = (1) * (1 + 0) * [ 0.48 + 0 - 0 - (0 - 0.3836) ]
NetToHit = 0.8636
but I observed 0.7293

2. Slash - defense debuff 7.5%

Strike against a +3 with no defense
NetToHit = (1) * (1 + 0.577) * [ 0.48 + 0 - 0 - (0 - 0) ]
NetToHit = 0.75696
which matches what I observed

the same with Slash in effect
NetToHit = (1) * (1 + 0.577) * [ 0.48 + 0 - 0 - (0 - 0.075) ]
NetToHit = 0.875235
but I observed 0.8338

When a defense debuff is involved the Last Hit Chance values I've seen don't match what I calculate - can anyone explain how it works please?

I noted the Last Hit Chance values for Decoy Phantasm, before & after Melt Armor affected the target.
One benefit of using Decoy Phantasm for this is it's not affected by accuracy enhancements so has the base 56% chance to hit +2s & 48% chance to hit +3s.
Melt Armor is enhanced to a 38.36% defense debuff (from 20%).

From Arcana's Guide to Defense:
NetToHit = (InherentAttackAccuracy) * (1 + AccuracyEnhancement) * [ BaseToHit + ToHitBuffs - ToHitDebuffs - (Defense - DefenseDebuffs) ]

I expected 38.36 to basically add to BaseToHit but the results (against a variety of targets) were always:

against +2s
base to-hit 56%
to-hit after MA 86.68%
so MA meant +30.68%
but expected +38.36%

against +3s
base to-hit 48%
to-hit after MA 72.93%
so MA meant +24.93%
but expected +38.36%

Any ideas how this works?