[Acillatem]

Runes were vital on Tallon Zek.

Whether it's the WIZ version or ENC version the way they worked was as follows:

They absorbed all melee, and DD spell damage (up to the limit of the rune).

The DD portion of a DoT was absorbed (so the initial hit) but after that the DoT penetrated directly to the player.

Damage Shields stacked with Runes - they currently don't (in other words as it is now - if I have a DS on AND a Rune up, and a mob hits me, the DS won't hit the mob).

It wasn't until later that they introduced Spellshield - a spell specifically designed to absorb ONLY DD spell damage. We won't see that on P99 as this was post-Velious.

I honestly don't remember the stun aspect - but I DO know I could channel a spell while getting my ass beat by a melee - so I'm assuming melee based stuns/bashes did NOT penetrate.

MR based stuns weren't really used on TZ (everyone had insane MR, everyone knew this, therefore nobody used stuns lol). So I can't honestly say how Spell-based stuns were handled via runes one way or the other.