Umbral Fiber

Effects and rank scaling

At maximum rank, Umbral Fiber grants +100% Armor and +11% Tau Resistance. Rank 0 lists +9% Armor and +1% Tau Resistance; rank 5 lists +55% and +6%. The mod does not specify a flat armor amount, so the listed percentage should not be read as a fixed armor value.

Fit and investment

It is a standard Warframe mod with Umbra polarity, base drain 6, and maximum rank 10. Later fusion costs rise steeply: the listed rank 5 to 6 step costs 1,280 Endo and 61,824 Credits, and rank 9 to 10 costs 20,480 Endo and 989,184 Credits. Invest according to how much the defensive stats matter to the frame and the capacity available.

Armor alternatives and limits

Steel Fiber lists +100% Armor, with Vazarin polarity and base drain 4; Flawed Steel Fiber lists +32% Armor with the same listed polarity and base drain 2. Umbral Fiber shares Steel Fiber's named armor effect while adding Tau Resistance, but uses Umbra polarity and costs more base drain. Adaptation instead gains resistance to a damage type when damaged, stacking up to 90% for 20 seconds; that is a different conditional defensive effect.

Limitations and tradeoffs

• The Umbra polarity and base drain 6 can make fitting it more demanding than the listed Steel Fiber options.
• Late fusion ranks have high listed Endo and Credit costs.
• Armor and Tau Resistance are the listed effects; the mod does not itself specify health or damage reduction values.