So there a few means to reduce allies damage, some questions around that:
1. If a skill says 'reduce allies damage by x', does it also reduce their own?

2. Is there a cap on how dmg can be reduced? Say i have of GPD (allies have 35% dmg reduction) and random others with talismans like Ragnarok (allies have 60% dmg reduction), Destiny (iirc, allies have 20% dmg reduction) and Celestial (iirc, allies have 30% dmg reduction after first round)... by my crappy math, thats 115% on round 1 and 145% after that. Theoretically... that team, bearing no passive disables are in play, would be quite literally invincible.

Obviously, its not that easy, cant be. I still get destroyed by teams i know dont have passive disable. What am i missing? Do things like stun, sleep, or silence impact passives/talisman passives like Ragnarok? Do certain damage types (maybe true?), buffs, dots, perfect-something?, marks, or penetration play a role? Quite curious.

I am at the odd place of destroying most regular content and some of the frontier dungeons (trooper, trooper respite (can farm madbess but insanity), LOL XIV and lower (cannot seem tonfarm XV), frozen wasteland, and a couple others. Farming things like labyrinth, ravens altar, eternal, powerslave seem out of reach. I am relatively new, have a couple 2* awakened toons (cyborg eddie and alchemist) and a lot runes/shards/etc. (just low on 2* colorless), as well as some nice characters like GRE, DDE, Alexander, the killer, killer beast, liliths (blue, purple, gold), nomad, christ ghosts past, present and future (all of whom rock for me). Some nice talisman sets too, like ragnarok, destiny, viper, limbo, serenity, valhalla, and some good 3* cosmics of carious tiers and color (2x echo, a couple atk x magic, future and gppd color atk, def and hp as well). Most guides point me to toons i dont have (charlotte, prisoner, killer prime, etc.), who are all 'limited time event' or possible frontier store options (not that i can accumulate that much very fast, unless i am missing something). Or, they call talismans like orbit and a few others that seem really rare and hard to get. I did 1500 runs of troopers respite and onky netter 2600 of the 3500 frags needed for one orbit. So yeah, trying to find something work with my roster. Any input you may have on my questions above or situation would be kindly appreciated.