Problem with each of these:
Frost Armor:
31.25%, up to 50% damage resistance, BUT you need to use a Fragment to reach that latter number, AND you need to collect 8 Stasis Shards (barring exotics and stuff ofc) for up to 13 seconds, but it's only 9 at base.
Overshield:
45 HP Overshield with 70% resist to combatants, which I think makes it 150 HP? BUT the rate that it is applied from most things is super slow, AND it usually cost a lot to get it back, to full at least.
Possible Solutions:
Frost Armor:
• Whisper of Rime is no longer required for max stacks, though it still extends the duration, and [has a chance to] double(s) the number of stacks gained from Shards
• Stacks decay over time instead of all being removed at once
Overshield:
• Much faster trickle-on rate with abilities
• Potential slight bump to durability, seeing as it only last 10 seconds (which is fine, but it can also break)
• Otherwise, needs greater accessibility for non-Titans
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IMO here is how I would update them. Overshield: I would leave as is: Titan: has a couple of ways to make overshield. Also easiest path to do so. Warlock: has a healing rift and easiest path to make/ activate devour. Hunter: Easiest path with multiple options to go invisible. When invisible they should use that time to heal. Frost Armor: Titan: Maybe add something like Thruster, that replaces barricade but gives Frost Amor. Warlock: Either: add Frost Armor to Frostpulse Aspect or make something like Phenix Dive. Dive to the ground, and freeze nearby enemies and make shards that give you Frost Armor- or something to that effect. Hunter: Maybe make something like: Acrobat’s Dodge: but gives Frost Armor. Shards picked up before Dodge would increase how long Frost Armor lasts.